Dissertations / Theses: 'Krypton'

1

Firmann, Markus. "Dendritic solidification of krypton /." [S.l.] : [s.n.], 1987. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=8346.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Savard, Guy. "Saturation spectroscopy of krypton." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63379.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Ham, Hamphrey. "Etudes méthodologiques des applications médicales du krypton-81M." Doctoral thesis, Universite Libre de Bruxelles, 1986. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/241287.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Audet, Daniel. "Spectroscopie de polarisation : isotopes du krypton." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63319.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Petch, Jason Charles. "Resonant four-wave mixing in krypton." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243502.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

King, Sean J. "Electron impact excitation of krypton atoms." Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317100.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

KERDOUSSI, ABDERRAZAK. "Excitation multiphonique du krypton (#3p#1) et du xenon (5d) : spectroscopie dans l'ultraviolet lointain : cinetique du krypton." Toulouse 3, 1989. http://www.theses.fr/1989TOU30076.

Full text

Abstract:

Creation selective par absorption multiphotonique, de differents etats du krypton et du xenon dans les domaines de pression variable 10##1 a 800 torr. Aux fortes pressions, l'etat 1#u(#3p#1) est cree par absorption de trois photons laser et/ou par un photon provenant de la generation d'harmoniwue 3 du faisceau laser. Determination des constantes de disparition par choc a deux et trois corps de l'etat resonnant #3p#1, mise en evidence de la participation de l'etat metastable #3p#1 a la formation de l'etat moleculaire 1#u(#3p#2). Pour le xenon, excitation par absorption a trois photons des etats 5d(5/2)#0#j#=#3 et 5d (7/2)#0#j#=#3

APA, Harvard, Vancouver, ISO, and other styles

8

Kisand, Vambola. "Creation of free excitons in solid krypton investigated by time resolved luminescence spectroscopy." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=961700092.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Jabbour, Georges. "Etude des excimères de krypton et de xénon par TALIF : applications aux décharges à barrière diélectrique dans le krypton." Toulouse 3, 2009. http://thesesups.ups-tlse.fr/697/.

Full text

Abstract:

Ce travail porte sur l'étude des mécanismes réactionnels de formation des excimères de krypton et la mesure de l'influence de la température sur la formation des excimères de krypton et de xénon. Ces études permettent de rendre compte des phénomènes mis en jeu dans un milieu plus complexe (micro-décharge). Les expériences les plus récentes sur les mécanismes de formation des excimères font appel à l'étude de la fluorescence induite par absorption de deux photons laser (TALIF). Cette technique d'excitation a permis de peupler sélectivement les deux premiers excités du krypton et du xénon à partir desquels sont créés les excimères émettant le rayonnement UVL. L'étude temporelle des émissions UVL du krypton a été réalisée après peuplement sélectif soit du premier état métastable Kr5s [3/2]o2 soit du premier état résonant Kr5s [3/2]o1. La contribution de chacun de ces états dans les émissions UVL en fonction de la pression a ainsi pu être déterminée. Les processus conduisant a la formation des excimères ont été identifiés. Les taux de réactions par collisions à trois corps de disparition des états résonant et métastable ont été mesurées tout comme la durée de vie radiative de l'excimères Kr2 (A1u). Un transfert efficace de l'état résonant vers l'état métastable a été mis en évidence. Cette étude sous excitation sélective s'est poursuivie par l'étude de l'influence de la température sur la formation des excimères de krypton et de xénon. Elle a conduit à la détermination des lois de variation des constantes de disparition à trois corps des premiers états métastables de ces gaz en fonction de la température. Elles montrent sans ambigüité que ces constantes de réaction varient fortement en fonction de la température. Il s'agit là de données de base nouvelles obtenues pour la première fois en excitation sélective. Les études spectroscopiques et temporelles conduites en excitation sélective dans le krypton ont permis d'interpréter les mesures effectuées dans une micro-décharge. Les mesures électriques sont comparées à celles effectuées dans d'autres gaz rares lors d'études antérieures. Les mesures spectroscopiques et temporelles ont été analysées à partir de celles réalisées par fluorescence induite par laser
This work deals about the study of reactionnal mechanisms of krypton excimers forming and the influence of the temperature on the formation of krypton and xenon excimers. These studies can account for the phenomena involved in a more complex (micro-discharges). The most recent experiments of the mechanisms of the formation of excimers (involve the study) of the fluorescence induced via the absorption of two (photons laser) (TALIF). This excitation technique permits to selectively populate the first two excited states of krypton and xenon from which are created the excimers emitting UVL radiation (excitation spectroscopy). The study of temporal LVU emissions of krypton was performed after selective settlement, either from the first metastable state Kr5s [3/2]o2 or from the first resonant state Kr5s [3/2]o1. The contribution of each of these statements in UVL emissions depending on pressure has been determined. The process leading to the formation of excimers was identified. The reaction rates of disappearance of resonant and metastable states caused by the collision of three body, was measured as the radiative lifetime of the excimer Kr2 (A1u). A transfer, from the resonant state towards the metastable state was highlighted. This enabled us to complete the kinetic patterns obtained in the group in previous studies. This study under selective excitation was followed by studying the influence of temperature on the formation of excimer krypton and xenon. It led to the determination of laws of constants variation of disappearance of the first metastable states of these gases depending on temperature. They show unambiguously that the reaction constants vary greatly depending on temperature. This is the basis of new data obtained for the first time in selective excitation. Spectroscopic and temporal studies conducted in selective excitation in krypton, permitted to interpret the measurements in a micro-discharge by the team. The electrical measurements are compared to those made in other rare gases in previous studies. The temporal and spectroscopic measurements were analyzed from those produced by laser-induced fluorescence

APA, Harvard, Vancouver, ISO, and other styles

10

Shrimpton, Neil Douglas. "Low temperature behavior of krypton monolayers on graphite." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27531.

Full text

Abstract:

The low temperature behaviour of a system of incommensurate krypton monolayers on graphite was analysed. The free energy was calculated for a variety of monolayer configurations and the misfit and orientation of the minimum energy configuration determined as a function of the temperature and chemical potential of the system. The free energy did not vary significantly over the temperature range from 0 K to 4 K. The zero point energy contributes significantly to the free energy and could not be neglected. The lowest energy vibrational modes were determined; these modes correspond to motion of the domain walls. For configurations with clearly separated domain walls the vibrational modes separated into groups of three (triads). In the lowest energy triad, the lowest energy mode was a compressional mode. The second and third lowest modes were shearing modes. These three modes describe the fundamental forms of domain wall motion. The modes of the higher energy triads are more energetic forms of the lowest energy triad.
Science, Faculty of
Physics and Astronomy, Department of
Graduate

APA, Harvard, Vancouver, ISO, and other styles

11

Dubeau, Jacques. "Isotope shift measurements of the stable krypton isotopes in natural and enriched concentrations." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66154.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Grivet, Manuel. "Contribution a l'analyse du phenomene de recuit thermique des traces de fission de l'uranium dans l'apatite." Besançon, 1994. http://www.theses.fr/1994BESA2008.

Full text

Abstract:

Les traces de fission spontanees de l'uranium dans l'apatite permettent la datation de ce mineral. Cependant, elles sont sensibles a une elevation de temperature en disparaissant progressivement. La technique couramment utilisee pour caracteriser l'etat de recuit des traces est la mesure de leurs longueurs par microscopie optique, apres revelation par un agent chimique approprie. C'est la repartition de ces longueurs qui est la plus a meme de nous fournir l'essentiel de l'histoire thermique de l'echantillon. C'est pourquoi nous proposons et developpons un modele de calcul permettant de simuler les histogrammes de longueurs projetees des traces de surface. A partir de ce modele, il est possible de transposer la repartition des longueurs en une construction graphique dans laquelle intervient l'echelle des temps: c'est la fonction d'age. Celle-ci permet d'obtenir des renseignements importants sur l'histoire thermique tels que la date de passage a 120#oc ou le temps de residence dans la zone de retention partielle des traces. Plusieurs applications de ce modele sur des materiaux geologiques sont presentees. Par ailleurs, une etude en microscopie electronique a transmission du diametre de double-repliques de traces d'ion kr, en fonction des temps de recuit et de revelation, est decrite. Elle montre une dependance de la vitesse d'attaque chimique radiale des traces vis-a-vis du temps de recuit et de la profondeur atteinte a l'interieur du mineral. Elle met aussi en evidence une evolution de la dispersion des diametres avec le recuit. Dans l'analyse mathematique des cinetiques d'effacement et de production des traces, ce dernier resultat nous conduit a utiliser un terme d'energie d'activation variant en fonction du recuit. Le but de cette approche est de resoudre de maniere unique le probleme de reconstruction d'histoires thermiques a partir de repartitions de longueurs de traces

APA, Harvard, Vancouver, ISO, and other styles

13

Fuchs, Tino. "Spektroskopische Untersuchungen hochgeladener Krypton-Ionen im Röntgen-Bereich." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=959625038.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Hamada, S. A. "On-line measurements on krypton and xenon isotopes." Thesis, University of Sussex, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373913.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Fuchs, Tino. "Spektroskopische Untersuchungen hochgeladener Krypton-Ionen im Röntgen-Bereich." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2000. http://dx.doi.org/10.18452/14477.

Full text

Abstract:

Diese Dissertation widmet sich der spektroskopischen Untersuchung verschiedener Aspekte der Strahlungsemis\-sion hochgeladener Krypton-Ionen mit Relevanz für die Fusionsforschung. Die Experimente hierzu erfolgten an der Berliner Elektronenstrahl-Ionenfalle (EBIT). Der erste Teil der Arbeit hat die Messung kanalspezifischer Wirkungsquerschnitte für die dielektronische Rekombination (DR) der KL$n$-Resonanzserie ($n$=2, \ldots, 5) von Helium- bis Kohlenstoff-ähnlichen Kr-Ionen ($\mbox{Kr}^{(34\, \ldots\,30)+}$) zum Inhalt, die relativ zum Wirkungsquerschnitt der nichtresonanten strahlenden Rekombination (RR) bestimmt wurden. Die Anpassung der Anregungskurven durch eine Modellfunktion aus berechneten Resonanzst ärken ermöglichte den Vergleich mit theoretischen DR-Wirkungsquerschnitten. Es zeigt sich, dass Vorhersagen des HULLAC-Atomstrukturcodes für die Resonanz\-st"ar\-ken der Kr-Ionen durch das Experiment innerhalb der Me"sunsicherheiten best"a\-tigt werden. Darüber hinaus wurde auch die Relaxation der einfach angeregten Ionen nach erfolgtem DR-Stabilisierungsübergang analysiert. Die zur Auswertung der DR-Anre\-gungs\-kurven angewandte Technik eröffnet gleichzeitig eine spektroskopische Methode für die Bestimmung der relativen Konzentration hochgeladener Ionen in EBIT. Die Messung der Strahlungskühlungsrate von Krypton, die den zweiten inhaltlichen Schwerpunkt der Dissertation darstellt, wäre ohne diese in situ Diagnostik der Ladungbilanz nicht möglich gewesen. Hier wurde die Ionenfalle so eingestellt, dass sich eine Ladungsverteilung herausbildet, die dem Ionisationsgleichgewicht eines Plasmas bei einer Temperatur von etwa $5\;\mbox{keV}$ entspricht. Die Bestimmung der Strahlungsk"uhlungsrate profitierte von dem Potential einer EBIT, die gefangenen Ionen mit Elektronenenergien aus einem weiten Bereich abzutasten und einzelne Strahlunsprozesse selektiv anzuregen. Die Röntgenemission verschiedener Strahlungskanäle, wie Bremsstrahlung, strahlende Rekombination, dielektronische Rekombination und Linienstrahlung nach direkter Anregung wurde separat erfaßt. Hieraus konnten erstmals kanalspezifische Strahlungskühlungsraten bestimmt werden. Es stellte sich heraus, dass der dominante Beitrag zur Strahlungskühlungsrate durch die direkt angeregte Linienstr ahlung des L-Schalen-Spektrums zustande kommt, die etwa 75\% der gesamten Verlustleistung ausmacht. Beim Vergleich der totalen Strahlungsverlustleistung mit Vorhersagen der Theorie sind Abweichungen festzustellen. Die berechneten Werte sind je nach Modell um einen Faktor 1.5 - 2.0 kleiner als das Ergebnis der Messung. Dieser Unterschied liegt außerhalb der experimentellen Unsicherheit von maximal 30\%.
This thesis deals with the spectroscopic investigation of various aspects of the x-ray emission of highly charged krypton ions with relevance for fusion research. The experiments have been performed at the Berlin electron beam ion trap (EBIT). One part of the work was devoted to the measurement of channel-specific cross sections for dielectronic recombination (DR) via the KL$n$ ($n$=2, \ldots, 5) resonance series of He- to C-like krypton ions ($\mbox{Kr}^{(34\, \ldots\,30)+}$). The DR cross sections were determined relative to the cross section for non-resonant radiative recombination (RR). A fit procedure was used to compare the measured data with theoretical calculations. Predictions of the HULLAC atomic structure code are confirmed within the experimental uncertainties. Additionally, the radiative relaxation mechanism following the stabilizing transition in the DR process was analyzed. The approach used to obtain the DR excitation function opens up a spectroscopic method to determine the relative abundance of the highly charged ions in the trap. This in situ diagnostic of the charge state balance allowed for the measurement of the radiative cooling rates of krypton being the second focus of the thesis. For this purpose EBIT was tuned to a charge state distribution approaching the ionization balance of a plasma at a temperature of about $5\;\mbox{keV}$. EBIT's capability to sample a wide range of electron-beam energies and distinguish between different radiation channels was utilized to determine the cooling rate. The x-ray emission from the various plasma radiation channels, like bremsstrahlung, radiative recombination, dielectronic recombination, and line radiation following electron-impact excitation was analyzed. For the first time, channel-specific cooling rates could be obtained from these data. It was found, that the dominant contribution to the cooling rate is made up by the directly excited x-rays of the L-shell spectra of krypton, producing more than 75\% of the total radiation loss. A difference with theoretical calculations is noted for the total cooling rate. The predicted values are lower by a factor of 1.5 - 2.0, depending on the theoretical model. This discrepancy is clearly beyond the experimental uncertainty of 30\% at maximum.

APA, Harvard, Vancouver, ISO, and other styles

16

Segal, D. M. "Collisional redistribution of light in the Mercury-Krypton system." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47249.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Faxas, Miguel A. Jr. "Experiments in the dissociative recombination of xenon and krypton." FIU Digital Commons, 2005. http://digitalcommons.fiu.edu/etd/3288.

Full text

Abstract:

Experiments were conducted using the Time of Flight (TOF) method to identify the final product states of the dissociative recombination reaction of krypton and xenon. In the dissociative recombination (DR) reaction the molecular ion breaks up into product atoms whose velocities can be measured. These velocities can then be used to identify the final product states. The DR of krypton had been studied by Shiu and Biondi using spectrometric techniques. They observed the 5p states. Hardy et al. using TOF techniques had observed the 5s states. Mitchell et al. studied the DR of xenon. They observed the 6p and 5d states of xenon. In this laboratory using the TOF method I have recently identified the 5s, 6p and the 4d final states of the DR of krypton. Then I was able to identify the 5d, 7s, 6d, and 6p' final product states of vi the DR of xenon. The study of the DR of these heavy inert gases can shed light on the theory of the DR of heavy polyatomic gases, which is not well developed.

APA, Harvard, Vancouver, ISO, and other styles

18

Lu, Miao. "Photoionization and electron-impact ionization of multiply charged krypton ions." abstract and full text PDF (free order & download UNR users only), 2006. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3221392.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Mat, Yunus W. M. "Ionization processes and breakdown in krypton and rare gas mixtures." Thesis, Swansea University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638025.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Murray, Paul B. "Angular correlation study of the lowest excited state of krypton." Thesis, Queen's University Belfast, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336009.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Dobie, Paul J. "Microwave excitation of argon ion and helium-krypton ion lasers." Thesis, University of St Andrews, 1989. http://hdl.handle.net/10023/14163.

Full text

Abstract:

Pulsed microwave excitation of noble gas ion lasers at frequencies between 3 and 17 GHz is investigated. The advantages of using microwaves instead of conventional DC sources to pump a laser are explained. These include the lower electrode and discharge tube wear due to the oscillating nature of a microwave electric field. The propagation of microwave radiation in an ionised gas is examined. At the frequencies used, the skin depth of an Argon ion laser discharge is shown to be approximately 1 mm, indicating good microwave power absorption. The dependence of the microwave power absorption on the frequency is shown to be weak. Microwave transmission at a dielectric/gas-discharge boundary, similar to those in the laser coupling structures used, is found to be around 1% of the incident power. It is suggested that for maximum laser efficiency, microwave power should be introduced directly into the gas discharge. Two microwave coupling structure designs for supplying microwave power to the laser discharges are described. The first of these, a waveguide coupler device based on the 3dB branch guide coupler, produces a transverse electric field across the laser tube. The procedure used to design a branch guide coupler using a Chebyshev impedance taper and T- junction discontinuity corrections is outlined, and a description of the entire laser coupling structure is given. The second design comprises a helix wrapped round the laser tube and produces an axial electric field. The electric field distribution around a helix is calculated as a function of helix parameters and the effects of surrounding objects are considered. The best helix dimensions are found for optimum laser operation. The characteristics of conventional Argon ion and Helium-Krypton ion lasers are given. No significant differences between conventional noble gas ion lasers and the microwave excited lasers reported here are observed. At the input powers used (~100 kW peak, 1 uS pulses, 1000 pps), 100 mW, 1 uS and 30 mW, 5 uS laser pulses are observed from Argon and Helium-Krypton gas mixtures, respectively. The transverse and axially excited lasers perform equally well.

APA, Harvard, Vancouver, ISO, and other styles

22

Yaman, Mecit. "Investigation of Krypton bubbles in copper using x-ray techniques." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/6994.

Full text

Abstract:

Includes bibliographical references.
Investigation of the micro-mechanical properties of bulk copper, containing a high concentration (3 atomic %) of krypton is performed by X-ray diffraction techniques. Stress determination and phase analysis are carried out to determine the residual stress of the host copper metal and the internal pressure of the krypton bubbles. Lattice parameter determination of krypton bubbles conﬁrms solidiﬁcation of krypton with a fee structure epitaxial to the host metal with a bubble pressure of 2.6 GPa. The sin2 φ technique of stress determination indicates no macro residual stress inside the copper matrix as predicted by the continuum ansatz of the elasticity theory. The pressure of the krypton bubbles manifests itself as a shear strain in the copper matrix and the shear strain is found to be below the yield strength of the copper matrix, thus explaining the long-term stability.

APA, Harvard, Vancouver, ISO, and other styles

23

Lehmann, John F. Schrobilgen Gary Lee John. "Crystallographic, spectroscopic and theoretical studies of fluoro- krypton(II), xenon(II), gold(V) and halogen(VII) compounds; and New synthetic developments in bromine(VII) oxide fluoride chemistry /." *McMaster only, 2004.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

24

Pravica, Luka. "Polarised electron studies of spin-dependent interactions in zinc and krypton atoms." University of Western Australia. School of Physics, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0063.

Full text

Abstract:

[Truncated abstract.] An apparatus has been built, tested and characterised with greatly increased precision and accuracy to enable spin-polarised electron impact explorations of angular momentum effects in atoms. A combination of experimental, computational and interpretative studies has revealed new phenomena. In zinc the polarisation of the radiated photons from excited and ionised-with-excited atoms was measured in terms of integrated Stokes parameters (P1, P2 and P3) and related to electron exchange and spin-orbit interaction using normalised state multipoles.

APA, Harvard, Vancouver, ISO, and other styles

25

Ternon, Jean-François. "Mise au point de la mesure du krypton-85 dans des echantillons oceaniques par comptage beta, et utilisation du krypton-85 comme traceur en oceanographie." Paris 6, 1990. http://www.theses.fr/1990PA066698.

Full text

Abstract:

Le krypton, isotope radioactif d'origine anthropogene, est utilise en oceanographie comme traceur (transitoire) des masses d'eau. Les tres faibles concentrations mesurees dans le milieu marin imposent un processus analytique complexe, qui consiste a prelever et a degazer de grands volumes d'eau (deux cents litres), a separer le krypton total parmi les gaz extraits et a mesurer le krypton-85 par comptage radioactif bas niveau. La mise au point des etapes de separation du krypton et de comptage radioactif est presentee. La separation est effectuee par elution fractionnee sur charbons actifs, et par chromatographie en phase gazeuse (colonnes de charbons actifs et de tamis moleculaire). La mesure du krypton-85 est realisee a l'aide de mini-compteurs a gaz, utilises en regime proportionnel. La reduction du bruit de fond est obtenue grace a l'utilisation de plusieurs niveaux de blindage et d'un systeme d'anticoincidence. Les performances de notre systeme de mesure du krypton-85 dans l'eau de mer sont equivalentes a celles de la seule installation operationnelle a ce jour (smethie et mathieu, 1986). En tant que traceur en oceanographie, le krypton-85 est en concurrence directe avec les chlorofluorocarbones, qui presentent des caracteristiques similaires, mais dont l'analyse est beaucoup plus rapide. Une etude comparative, menee sur les quelques profils krypton-85/cfc disponibles aux memes stations, est presentee

APA, Harvard, Vancouver, ISO, and other styles

26

Went, Michael Ray, and n/a. "Scattering of Spin Polarized Electrons from Heavy Atoms: Krypton and Rubidium." Griffith University. School of Science, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040220.134142.

Full text

Abstract:

This thesis presents a set of measurements of spin asymmetries from the heavy atoms krypton and rubidium. These investigations allow examination of the spin orbit interaction for electron scattering from the target atoms. These measurements utilise spin polarized electrons in a crossed beam experiment to measure the Sherman function from krypton and the A2 parameter from the 52P state of rubidium. The measurements utilise a new spin polarized electron energy spectrometer which is designed to operate in the 20-200 eV range. The apparatus consists of a standard gallium arsenide polarized electron source, a 180 degrees hemispherical electron analyser to detect scattered electrons and a Mott detector to measure electron polarization. A series of measurements of the elastic Sherman function were performed on krypton at incident electron energies of 20, 50, 60, 65, 100, 150 and 200 eV. Scattered electrons are measured over an angular range of 30-130 degrees. These measurements are compared with calculations of the Sherman function which are obtained by solution of the Dirac-Fock equations. These calculations include potentials to account for dynamic polarization and loss of flux into inelastic channels. At the energies 50, 60 and 65 eV, experimental agreement with theory is seen to be extremely dependent on the theoretical model used. Measurement of the A2 parameter from the combined 52P1/2,3/2 state of rubidium are performed at an incident energy of 20 eV. The scattered electrons are measured over an angular range of 30-110 degrees. This measurement represents the first such measurement of this parameter for rubidium. Agreement with preliminary calculations performed using the R-matrix technique are good and are expected to improve with further theoretical development.

APA, Harvard, Vancouver, ISO, and other styles

27

Went, Michael Ray. "Scattering of Spin Polarized Electrons from Heavy Atoms: Krypton and Rubidium." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/365606.

Full text

Abstract:

This thesis presents a set of measurements of spin asymmetries from the heavy atoms krypton and rubidium. These investigations allow examination of the spin orbit interaction for electron scattering from the target atoms. These measurements utilise spin polarized electrons in a crossed beam experiment to measure the Sherman function from krypton and the A2 parameter from the 52P state of rubidium. The measurements utilise a new spin polarized electron energy spectrometer which is designed to operate in the 20-200 eV range. The apparatus consists of a standard gallium arsenide polarized electron source, a 180 degrees hemispherical electron analyser to detect scattered electrons and a Mott detector to measure electron polarization. A series of measurements of the elastic Sherman function were performed on krypton at incident electron energies of 20, 50, 60, 65, 100, 150 and 200 eV. Scattered electrons are measured over an angular range of 30-130 degrees. These measurements are compared with calculations of the Sherman function which are obtained by solution of the Dirac-Fock equations. These calculations include potentials to account for dynamic polarization and loss of flux into inelastic channels. At the energies 50, 60 and 65 eV, experimental agreement with theory is seen to be extremely dependent on the theoretical model used. Measurement of the A2 parameter from the combined 52P1/2,3/2 state of rubidium are performed at an incident energy of 20 eV. The scattered electrons are measured over an angular range of 30-110 degrees. This measurement represents the first such measurement of this parameter for rubidium. Agreement with preliminary calculations performed using the R-matrix technique are good and are expected to improve with further theoretical development.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Science
Full Text

APA, Harvard, Vancouver, ISO, and other styles

28

Homan, Mark Eugene. "A krypton VUV photoionization source for gas chromatography and mass spectrometry." Diss., The University of Arizona, 1990. http://hdl.handle.net/10150/185223.

Full text

Abstract:

The use of a coaxial krypton discharge lamp to selectively photoionize samples in a complex matrix is described. The lamp produces a krypton line emission spectrum with available photon energies of 10.0 and 10.6 eV. When used as a photoionization mass spectrometer source, conditions can be created where molecular ions can be produced which do not undergo fragmentation. This effect can greatly simplify spectral interpretation in the case of either direct sample introduction or coelution from a chromatographic column. Mixtures containing 6 to 8 components can be analyzed by direct injection with detection limits for most of the components below the 100 x 10⁻⁹ g level. Data is also presented demonstrating the lamps ability to switch between photoionization conditions producing primarily molecular ions and conditions producing spectra similar to those produced by electron impact sources. This ability would allow two complimentary sets of mass spectrometric information to be gathered during a single run. Using the lamp as a photoionization GC detector, a LOD of 12 x 10⁻¹² g for benzene has also been determined.

APA, Harvard, Vancouver, ISO, and other styles

29

Bouchez, Emmanuelle. "Coexistence de forme dans les noyaux de krypton légers : Spectroscopie isométrique des noyaux de 72,74Kr et excitation coulombienne du faisceau radioactif de 76Kr." Université Louis Pasteur (Strasbourg) (1971-2008), 2003. http://www.theses.fr/2003STR13194.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Falcoz-Vigne, Vincent. "Définition d'un principe de détection de fluorescence induite applique au diagnostic en cancérologie." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL065N.

Full text

Abstract:

Le diagnostic de certains cancers par détection de fluorescence induite par laser krypton constitue un nouvel espoir dans l'éventail des techniques modernes de dépistage de la maladie. Elle fait appel aux derniers développements en matière de lasers médicaux et d'agents photosensibilisants. Les propriétés de rétention sélective de ceux-ci (notamment l'hematoporphyrine et ses dérivés) dans les zones tumorales et leur excitabilité dans une longueur d'onde adéquate, constituent la base de cet aspect de la thérapie photodynamique. Le bas niveau de la fluorescence des colorants, et l'autofluorescence naturelle des tissus sains sont autant de problèmes concernant la mise en évidence de la frontière tissus sains-tumeur. Par ailleurs, le manque de sélectivité des photosensibilisants dans leur localisation, et parfois leur toxicité, amplifient encore ces difficultés. Ceci nous a amené à concevoir un système qui puisse s'affranchir de ces difficultés, depuis la prise d'image, jusqu'a la visualisation sur moniteur. Une source d'excitation monochromatique un laser krypton achemine par l'intermédiaire d'une fibre optique, l'énergie excitatrice sur le site à observer. L'image du site recueillie par un endoscope est envoyée vers un système optique de discrimination par filtrage de l'autofluorescence et de la fluorescence induite. Une camera intensificatrice effectue une forte amplification du signal, et un système de traitement informatique rehausse les contrastes, et supprime la contribution de l'autofluorescence par traitement soustractif. L'image traitée est finalement visualisée sur un moniteur couleur. Des campagnes de mesures expérimentales sur des fantômes nous ont permis de valider le système de détection et de tirer les premières conclusions quant à son efficacité

APA, Harvard, Vancouver, ISO, and other styles

31

Daerr, Heiner [Verfasser]. "Optische Systeme und Konzeptionen für die Ultraspurenanalyse von Krypton-Isotopen / Heiner Daerr." München : Verlag Dr. Hut, 2011. http://d-nb.info/101898089X/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Oberdorfer, F., Q. Akkam, J. Schneider, S. Alyanbawi, and I. Al-Jammaz. "Development of a Krypton target for Cyclone-30 at KFSH&RC." Helmholtz-Zentrum Dresden - Rossendorf, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-165913.

Full text

Abstract:

Introduction Krypton-81m is a radioactive gas with a half-life of 13 s, and found to be useful in many applications in nuclear medicine, particularly for lung perfusion studies and ventilations. Due to high demands for 81mKr, we have developed an automated Krypton system to be installed in one of the Cyclotron’s beamlines at King Faisal Specialist Hospital and Research Centre (KFSH&RC) and to deliver large activity of the radioactive gas. Material and Methods The effective cross section of producing 81Rb is between 15 and 30 MeV [1]. Therefore, range and stopping power of the effective cross section were calculated with respect to gas density of 0.0185 g/cm3. This value is equivalent to gas density at 5.0 bars at room temperature. SRIM calculations resulted in a range of 589 mm. However, due to limitation in fabricating such long target chamber, the target length is chosen to be 250 mm. Attached to the end of target body is a special water circulating flange ‘back-pool’, its purpose is to absorb the rest of the energy and protons Bragg peak. The target body is made of Aluminum with the inner part being electroplated with nickel. The target body is of conical shape. The target body is electrically isolated from other parts to allow accurate beam current reading. Full access to the target loading/unloading steps is made through touch screen technology (FIG. 2) for user access. Additionally, the target control system is designed to be protected through chain of interlock steps. The production cycle of 81Rb is explained as follow. Target is evacuated to approximately 10−3 mbar before being filled with natKr at pressure of 5 bars. At the end of bombardment, recovery of natKr is done via cryogenic vessel. Finally, the radioactivity is washed with KCl and pushed to Hotcells through the nitrogen gas for chemistry processing. Irradiation time was approximately 30 min. Results and Conclusion Experimental results clearly showed a fairly good activity of 81mKr as shown in TABLE 1. In all experiments, the radionuclidic purity of 81mKr was above 99.59%. 79mKr and 79Kr were also measured with a percentage of, respectively, 0.34 and 0.07 %. Special attention has to be drawn to last experiment where the yield significantly in-creased, due to the period where the KCl left inside the target (10 min) before pushing the solution to the Hotcells

APA, Harvard, Vancouver, ISO, and other styles

33

Lettmann, Marc. "Spectroscopy of neutron-rich germanium and krypton isotopes - A quest of triaxiality." Phd thesis, TUprints, 2018. https://tuprints.ulb.tu-darmstadt.de/7382/7/Dissertation_Lettmann_27_4_2018.pdf.

Full text

Abstract:

This work covers the spectroscopic analysis of 84,86,88Ge and 94,96Kr isotopes populated by different reactions within the SEASTAR campaign 2015. The experimental setup and the data analysis are described in detail. This analysis includes necessary functionality checks and calibrations of the detectors along the beam line. In-flight γ-ray spectroscopy of 84,86,88Ge was performed after various knock-out reactions. γ-spectroscopy of neutron-rich 88Ge was performed for the first time. The Doppler-corrected γ-ray spectra are analyzed with simulated lineshapes of occurring transitions. In total 16 transitions are observed ten of which so far unknown. New level schemes for 86,88 Ge are proposed based on the observed transition intensities and systematics of neighboring Ge isotopes. The obtained level schemes are compared to state-of-the-art theoretical calculations. The assignment of a 3⁺ state of 86Ge agrees with new shell model and SCCM predictions. The agreement to the level orderings from the collective model by Davydov and co-workers points to an amount of rigid triaxiality in 86Ge. This is the first indication of rigid triaxiality in an unstable, neutron-rich nucleus. In addition, an analysis of reaction cross sections, as well as cross sections for the excitation of a particular state is performed. This data set represents one of the first results for this newly-accessible region of the nuclear chart. Furthermore, 84,86Ge and 94,96Kr are investigated after (p,p') reactions, which excite different states than the knock-out reactions. These states are candidates for octupole 3⁻ states, which are the first benchmark for the octupole degree of freedom in this exotic region. The obtained (p,p') cross sections of the 2⁺₁ states from 94,96Kr are compared to the transition strength known from literature based on the deformation length.

APA, Harvard, Vancouver, ISO, and other styles

34

Jain, Prachi Lalit. "Characterization of a Low Current LaB6 Heaterless Hollow Cathode with Krypton Propellant." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/99141.

Full text

Abstract:

A first-generation LaB6 heaterless hollow cathode with a flat-plate anode is experimentally investigated. The cathode is characterized using krypton as propellant at varying flow rates, discharge currents and cathode-anode distances. Voltage probes, used to make direct voltage measurements in the ignition circuit, are the only diagnostic tool used experimentally. A plasma model is used to infer plasma parameters in the cathode emitter region. The cathode characterization results are consistent with those obtained during previous investigations of 1 A-class LaB6 hollow cathode with krypton. A peak-to-peak anode voltage criterion is used to identify the discharge modes and the occurrence of mode transition. Fourier analysis of the keeper and anode voltage waveforms carried out to study the discharge mode behavior reveals resonant frequencies ranging from 40 to 150 kHz. Lastly, post-test visual observations of the cathode components show signs of emitter poisoning and keeper erosion.
Master of Science
Recent years have seen rapid growth in the development of both stand-alone satellites and satellite constellations. A critical component of these satellites is the on-board propulsion system, which is responsible for controlling their orientation with respect to the object of interest and keeping the spacecraft in the assigned orbit. Generally, electric propulsion systems are used for this purpose. These types of propulsion systems use electrical power to change the velocity of satellite, providing a small thrust for a long duration of time as compared to chemical propulsion systems. Certain types of electric thrusters utilize a hollow cathode device as an electron source to start-off and support the thruster operation. In this research, a non-conventional hollow cathode for low power applications is developed and tested. The main characteristic of the developed cathode is the heaterless configuration, which eliminates the heater module used in conventional cathodes to enable the cathode to reach its operational temperature. The absence of a heater reduces the complexity of the cathode and the electrical power system. The cathode utilizes an electron emitter material which is insensitive to impurities and air exposure. Additionally, unlike typical electric thrusters which use xenon as the fuel, this cathode uses krypton which is similar to xenon but is less expensive. The presented work includes an overview of electric propulsion and the hollow cathode operation, followed by a detailed discussion of the heaterless hollow cathode design, the experimental setup and the test results. Several noteworthy findings regarding cathode operation are included as well. This research shows that the non-conventional heaterless hollow cathode and its operation with krypton have the potential to improve the overall thruster performance by reducing the weight and the cost, thus contributing to an integral aspect of satellite on-board propulsion.

APA, Harvard, Vancouver, ISO, and other styles

35

Tiwari, Ankit. "Fabrication of Temperature Responsive Membranes using 248 nanometer Krypton Fluoride Excimer Laser." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1529323637791699.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Patil, Renuka. "FABRICATION OF pH RESPONSIVE MEMBRANE USING 248 NANOMETER KRYPTON FLUORIDE EXCIMER LASER." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1626866059729935.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Ludin, Andrea Iso. "Kollineare Laserspektroskopie an einem Krypton-Atomstrahl zur Entwicklung einer alternativen 81Kr-Nachweistechnik /." [S.l.] : [s.n.], 1993. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Edwards, Ellen. "Measurement of Krypton Fission Product Yields from 14 MeV Neutrons on 238U." Thesis, University of California, Berkeley, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10930784.

Full text

Abstract:

Precisely-known fission yield distributions are used to determine a fissioning isotope and the incident neutron energies in nuclear security applications. 14 MeV neutrons from DT fusion at the National Ignition Facility (NIF) induced fission in depleted uranium (DU) contained in the target assembly hohlraum. The fission yields of Kr isotopes (85m, 87, 88, 89, and 90) were measured relative to the cumulative yield of 88Kr. The fission gas was pumped from the target chamber, collected, and analyzed in the Radiochemical Analysis of Gaseous Samples (RAGS) diagnostic. Isotopes with half-lives ranging 8 s-9 hr can be measured. Kr fission yields have been measured both from the fission of DU in the hohlraum and DU doped into the capsule ablator. Since the mass of U was not known, the relative amounts of Kr isotopes were calculated and compared to existing fission product distribution tables. It was found that measurements can be performed with high precision for isotopes with half lives longer than 4 minutes. A more precise quantification of gas transport needs to be achieved to quantify isotopes with shorter half lives to a precision of the published tables.

APA, Harvard, Vancouver, ISO, and other styles

39

Koirala, Prakash. "Experimental determination of the electric quadrupole moment and collisional depolarization of J=3/2 cesium atoms with krypton using linear polarization spectroscopy." Oxford, Ohio : Miami University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1217011195.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Atrill, Stefan Roger. "High resolution photofragmentation of cluster ions." Thesis, University of Sussex, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320362.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Museur, Luc. "Réalisation d'un laser pour l'ultraviolet lointain et application à l'étude des processus de relaxation radiatifs et collisionnels de dimères et d'agrégats gaz rares." Paris 13, 1994. http://www.theses.fr/1994PA132032.

Full text

Abstract:

Ce travail est consacré à l'étude des fluorescences résolues en temps, de complexes et d'agrégats de van der Waals excités sélectivement dans l'ultra-violet du vide (vuv). L'excitation vuv est réalisée par un laser pulsé à 125 nm, basé sur des techniques d'optique non linéaire de mélanges de fréquences dans une vapeur de mercure à température ambiante. Nous avons analysé en détail l'évolution de l'intensité vuv en fonction de l'intensité des faisceaux fondamentaux. Des simulations numériques, prenant en compte la géométrie gaussienne des faisceaux ainsi, que les problèmes liés à la réabsorption du rayonnement et aux modifications d'indice de réfraction par effet Kerr, nous ont permis de reproduire le comportement d'une des deux émissions laser. L'intensité de ce laser nous a permis d'exciter le krypton dans l'aile rouge du premier niveau excité métastable kr*(3p2). Nous avons pu ainsi étudier les processus spécifiques de formation de l'excimère kr*2(a1u/o-u), en mettant notamment en évidence le peuplement collisionnel d'un réservoir moléculaire métastable kr*2(1g) en équilibre dynamique avec le réservoir atomique métastable kr*(3p2). Nous nous sommes par ailleurs intéressés aux processus de relaxation radiatifs et collisionnelles dans le xénon excité pour la première fois à un photon sur l'état 5d1/2#1. Nous montrons notamment l'existence de deux canaux de relaxation, dont nous avons étudié le rapport de branchement. Nous présentons également nos premiers résultats sur l'analyse des processus de désexcitation des agrégats de krypton kr#n (n = 2 - 2000). Les mesures des durées de vie des dimères kr*2 éjectés ou solvatés dans l'agrégat sont discutées en tenant compte nos résultats obtenus en phase gazeuse.

APA, Harvard, Vancouver, ISO, and other styles

42

Mitev, Krasimir. "Modélisation numérique des mécanismes de fonctionnement d'un compteur proportionnel cylindrique utilisé pour la mesure absolue de l'activité volumique du krypton-85." Toulouse 3, 2005. http://www.theses.fr/2005TOU30241.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Murphy, J. L. "The use of krypton as a tracer to quantify reaeration in surface waters." Thesis, Queen's University Belfast, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273226.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Tallent, Mark Alfred. "The thermodynamics of adsorption hysteresis in the system krypton on controlled pore glass." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/28032.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Gough, Sean F. "The shape of excited krypton atomic states produced by low energy electron impact." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334528.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Tunde, Raji Abdulrafiu. "Changes in the near-surface stress in titanium caused by krypton ion-implantation." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/6515.

Full text

Abstract:

Word processed copy.
Includes bibliographical references.
In this work, the effect of krypton implantation on the morphology of titanium samples is investigated through scanning electron microscopy (SEM). Rutherford backscattering spectrometry (RBS) was also used to determine the dose and depth of implanted krypton. The krypton profiile in titanium, and the associated damage profile, was modelled with TRIM calculations. In addition, metallurgical techniques were also used to examine the microstructure details of the as-received, unimplanted titanium sample.

APA, Harvard, Vancouver, ISO, and other styles

47

Hughes-Riley, Theodore. "Development and application of hyperpolarized krypton-83 as a new MRI contrast agent." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14460/.

Full text

Abstract:

Hyperpolarized (hp) gases such 129Xe and 83Kr (spin I = 1/2 and I = 9/2 respectively) can allow for significantly enhanced signal in a number of magnetic resonance applications. As a result there has been a growing interest in recent years to advance hp noble gas technology to non-invasively image the airspace of lungs, with the goal of developing a helpful probe for lung pathologies. 83Kr longitudinal relaxation (T1) has been shown to be sensitive to various surface properties, and may prove to be an interesting for identifying certain diseases including those that change surface chemistry (such as cystic fibrosis) or the surface-to-volume ratio in the lung (like in emphysema). This thesis contains several studies furthering 83Kr lung imaging, while also exploring methods for 129Xe imaging. A major focus has been on increasing spin polarization of the noble gases, as an increased polarization yields a greater MR signal strength. A novel low-pressure spin-exchange optical pumping technique has been utilized in this work allowing for 83Kr polarizations exceeding 17.5 %; as opposed to 4.4 % previously reported in literature. Gas produced in this fashion must be pressurized to above ambient before it is possible for it to be delivered to a lung. Two methodologies for pressurizing the noble gas via compression are explored and optimized for hp gas delivery to excised lungs with 83Kr polarizations as high as 13.8 % achievable after compression. This ultimately allowed for the first ever coronal 83Kr lung images in an ex vivo lung model. Further work repeated with isotopically enriched 83Kr achieved a surface-sensitive T1 relaxation map in this system. Finally gas handling techniques where created to allow for efficient and thorough mixing of the hp noble gases and O2 while minimizing relaxation effects. This is vital for any future in vivo studies.

APA, Harvard, Vancouver, ISO, and other styles

48

Radwan, Jean. "Contribution à la mise au point d'une technique de mesure du Kr85 dans l'océan : étude et réalisation d'un système d'extraction, de séparation et de mesure du Krypton total dissous." Paris 6, 1986. http://www.theses.fr/1986PA066529.

Full text

Abstract:

Le Kr85 est un isotope radioactif produit par l'industrie nucléaire. Sa qualité de gaz rare, sa période de 10. 76 ans, son histoire atmosphérique bien documentée et sa fonction d'entrée dans l'océan raisonnablement connue en font un traceur océanographique intéressant pour l'étude de la dynamique océanique à des échelles de temps de quelques années à quelques décennies (formation des eaux profondes, ventilation de la thermocline). Du fait de la faible activité spécifique du Kr85 (quelques dpm/m3 d'eau) la mesure de cet isotope exige des moyens de prélèvement lourds (200 l d'eau par échantillon) et une procédure analytique en plusieurs étapes : le dégazage "in situ" de grandes quantités d'eau de mer. De 3 à 4 l d'air dissous, dont 15 mu de Kr, sont récupérables à partir d'échantillons de 200 l d'eau de mer; la séparation quantitative du krypton total (15 mu l pour 4 l d'air) de l'échantillon gazeux conditionné en mer; le comptage du programme indigo (indian gas ocean) (1983) avec 3 campagnes dans l'océan indien de 1985 à 1987, notre laboratoire s'est doté de moyens de prélèvements lourds et a décidé de développer sa propre technologie de mesure du Kr85 océanique. Le travail que nous présentons concerne les deux premières étapes, désormais acquises de l'analyse du Kr85 océanique : nous avons étudié et réalisé une installation embarquable et fiable de dégazage sous vide capable d'extraire, sous un débit de 8 l/mn, les gaz dissous dans des échantillons de 200 l d'eau de mer. Cette unité d'extraction a permis le dégazage de 160 échantillons d'eau de mer (campagne indigo 1 et 2), avec un rendement > 91% (comparable aux résultats de Smethie, et un taux de contamination par du Kr atmosphérique de l'ordre de 0,05%. Parallèlement à la préparation logistique de ces campagnes, nous avons conçu et réalisé une installation de séparation qui permet de récupérer quantitativement le Kr total de l'échantillon océanique par une série d'élutions fractionnées sur charbon actif, suivie de la purification définitive et de la mesure du Kr par chromatographie en phase gazeuse. Seuls 4% des 15 mu l de Kr attendus (pour 4 l d'air) sont perdus.

APA, Harvard, Vancouver, ISO, and other styles

49

Nadeau, Charles-É. "Étude spectroscopique de l'argon et du krypton au-delà de la seconde limite d'ionisation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0018/NQ45189.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Fiebiger, Stefan [Verfasser], René [Gutachter] Reifarth, and Uwe [Gutachter] Greife. "Neutroneneinfang an Krypton im astrophysikalischen s-Prozess / Stefan Fiebiger ; Gutachter: René Reifarth, Uwe Greife." Frankfurt am Main : Universitätsbibliothek Johann Christian Senckenberg, 2018. http://d-nb.info/1160733147/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'Krypton'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles