Дисертації з теми "Synchrotron Radiatio"
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Botez, Cristian E. "Synchrotron x-ray scattering studies of metallic surfaces /." free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3052151.
Повний текст джерелаCrosbie, Jeffrey. "Synchrotron microbeam radiation therapy." Monash University. Faculty of Science. School of Physics, 2008. http://arrow.monash.edu.au/hdl/1959.1/64948.
Повний текст джерелаBaine, Michael. "Laser undulated synchrotron radiation sources /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9956463.
Повний текст джерелаKrishnamurthy, Satheesh. "Synchrotron radiation studies of nanostructured materials." Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430334.
Повний текст джерелаMargaritondo, Giorgio, and Johann Rafelski. "The relativistic foundations of synchrotron radiation." INT UNION CRYSTALLOGRAPHY, 2017. http://hdl.handle.net/10150/625068.
Повний текст джерелаSalomon, Felix. "Refraction index modification by synchrotron radiation." [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-44255.
Повний текст джерелаLudwig, Wolfgang. "Development and Applications of Synchrotron Radiation Microtomography." Diss., lmu, 2001. http://nbn-resolving.de/urn:nbn:de:bvb:19-3447.
Повний текст джерелаWeaver, Jill Suzanne. "Synchrotron Radiation Studies of Magnetic Thin Films." Thesis, University of York, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485147.
Повний текст джерелаThompson, Stephen P. "Studies of cosmic dusts using synchrotron radiation." Thesis, Keele University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303876.
Повний текст джерелаWright, Andrew Edward. "Studies of reactive intermediates with synchrotron radiation." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242644.
Повний текст джерелаMartis, V. "Synchrotron radiation studies of multicomponent metal oxides." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1388216/.
Повний текст джерелаLiu, Wenqing. "Synchrotron radiation studies of spintronic hybrid systems." Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/8180/.
Повний текст джерелаBurimova, Anastasia. "Spectral and angular distributions of synchrotron radiation in quantum theory." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-21032015-220522/.
Повний текст джерелаConsideramos as características da radiação sincrotron (RS) no âmbito da teoria quântica. Para simplificar a descrição teórica do processo de radiação restringimos à consideração da emissão de único fóton. Para transições quânticas arbitrárias, as distribuições espectrais e angulares da potência da RS são dadas de forma analítica exata. Tratamos separadamente partículas escalares (bósons) e com spin ½ (elétrons). Atenção especial é dada às transições particulares, a saber, as transições ao primeiro estado excitado e estado fundamental. É mostrado que os componentes de polarização linear da radiação de elétron se trocam em relação à orientação de spin quando o elétron passa para o estado fundamental. Este fato pode ser considerado como uma comprovação analítica para a presença de -componente da radiação quântica no plano de movimento. Analisamos minuciosamente a radiação emitida pela partícula fracamente excitada. Várias funções são introduzidas para descrever a evolução dos perfis de distribuições angulares para sistemas de dois e três níveis. Para transições quânticas do primeiro estado excitado ao estado fundamental a análise comparativa da radiação de bósons e elétrons é realizada, e isso ajuda à estimar a influência de spin e sua direção sobre as características da RS. A radiação de elétrons não polarizados é considerada separadamente. Observando o comportamento dos ângulos efetivos, é fácil perceber a inconsistência da conclusão clássica bem conhecida sobre a concentração de radiação ultra-relativista total no plano do movimento. Mostramos que os ângulos efetivos da radiação quântica tendem aos valores finitos e não desaparecem na região ultrarelativista. Uma revisão breve da teoria clássica inclui a introdução do conceito novo, isto é a n-parte do espectro. A fim de encontrar um análogo clássico adequado para a radiação das partículas fracamente excitados, a ideia de reduzir o espectro clássico foi desenvolvida. Constatamos que as características da radiação calculadas para o espectro clássico reduzido permanecem em boa concordância, tanto quantitativa quanto qualitativa, com os seus análogos quânticos, pelo menos no que diz respeito aos espectros quânticos de uma ou duas harmônicas. Neste sentido, a teoria clássica do espectro reduzido pode ser chamada de representativa. A evolução do máximo no espectro da radiação é considerada em capítulo separado. A aproximação, comumente considerada na teoria classica para frequência crítica, é inválida quando as correções quânticas entram em cena. Mas existe uma possibilidade de encontrar as condições para o máximo transferir-se à harmônica maior do espectro quântico. É mostrado que as transferências ocorrem sucessivamente, comecando com a harmônica principal no caso não relativístico, e este resultado permanece válido, independentemente de spin. Para uma partícula escalar existe um conjunto fixo dos valores críticos do campo externo, de tal modo que a transferência do máximo da radiação entre duas harmônicas específicas pode acontecer somente quando a intensidade do campo externo é maior do que o valor crítico associado com essas harmônicas. Se essa condição não for satisfeita, a posição do máximo permanece inalterada. Verificamos que a presença de spin perturba esta condição, no caso do elétron os valores críticos da intensidade do campo dependem de número do nível inicial.
Neiser, Richard A. "Considerations in the design and operation of synchrotron radiation beamlines (including a discussion on the properties of synchrotron radiation." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/101246.
Повний текст джерелаM.S.
Melero, García Emilio. "Fragmentation studies of small molecules using synchrotron radiation." Licentiate thesis, KTH, Physics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1697.
Повний текст джерелаThis thesis presents experimental data on the fragmentationof gas phase sulfur hexafluoride (SF6) and deutheromethane(CD4) molecules after their interaction with synchrotronradiation in the energy range of 70-200 eV. The data wasobtained using coincidence spectroscopy between energy resolvedelectrons and ions (EREICO).
Degradation of the molecular bond upon selective ionizationof different molecular orbitals has been studied by measuringionic fragments in coincidence with energy selected electrons.Besides the direct ionisation of the orbitals also the indirectprocess, in which the hole is created by the decay of a highlyenergetic core-excited state, was studied. The differencesdetected in the fragmentation after the direct and indirectionisation of a selected orbital can be related, in some cases,with the relaxation of the nuclei in the potential energysurface of the core excited state during its lifetime, thusproviding information on the neutral core excited state.
An experimental set-up capable of photon inducedfluorescence spectroscopy (PIFs) studies of core excitedmolecules in the visible range has been constructed. Thistechnique can yield complementary information to the EREICOdata about the energy distribution in the fragmentation sincethe internal energy of excited emitted fragments that decay inthe visible can be measured. It also allows the detection ofpossible neutral fragments.
Bao, Zhuo. "Synchrotron Radiation Studies of Free and Adsorbed Molecules." Doctoral thesis, Uppsala University, Surface and Interface Science Division, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8610.
Повний текст джерелаThis thesis contains two parts. The first part concerns the research work on free molecules using synchrotron-radiation-related techniques. Auger electron spectra of two free open-shell molecules, O2 and NO, were studied experimentally and theoretically. Photoionization experimental technique with tunable synchrotron radiation source was used to induce core-level electron ionization and obtain the KVV normal Auger electron spectra. A quantitative assignment of O2 normal Auger spectrum was obtained by applying ab initio CI calculations and LVI Auger line shape simulations including the bond length dependence of Auger transition rates. The photon energy dependence of normal Auger electron spectra was focused on with photon energies in the vicinities of core-ionization threshold energies. Consequently, the MAPCI (Molecular Auger Post Collision Interaction) theory was developed. Taking the near-threshold O2 normal Auger spectrum as an example, the two extreme cases of MAPCI effect, “atomic-like PCI” and “molecular PCI”, were discovered and discussed. The effect of shape resonance on near-threshold molecular normal Auger spectrum was discussed taking NO near threshold normal Auger spectra as example.
The second part deals with research work on the chemisorption of small epoxy organic molecules, ethylene oxide, methyl oxirane, on Si (100) surfaces. Synchrotron radiation related techniques, UPS, XPS and NEXAFS, were applied. Based on the valence photoemission spectra, C 1s and Si 2p XPS spectra, the epoxy ring opening reactions of these molecules in chemisorption process were proved. Further tentative search for the surface-adsorbate CDAD effect was performed, and no evident circular dichroism was confirmed.
Cardwell, David A. "Compton scattering with gamma-rays and synchrotron radiation." Thesis, University of Warwick, 1987. http://wrap.warwick.ac.uk/99433/.
Повний текст джерелаMyles, Dean Aubrey Albert. "Synchrotron X-radiation studies of C-reactive proteins." Thesis, Keele University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305880.
Повний текст джерелаMiles, Andrew John. "Synchrotron radiation circular dichroism : standardisation and new methods." Thesis, Birkbeck (University of London), 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428084.
Повний текст джерелаMcCarthy, Joanne. "Magnetic Compton scattering with high energy synchrotron radiation." Thesis, University of Warwick, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263118.
Повний текст джерелаInnocenti, Fabrizio. "Photoelectron spectroscopy of reactive intermediates with synchrotron radiation." Thesis, University of Southampton, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417983.
Повний текст джерелаShilova, Anastasiia. "Development of serial protein crystallography with synchrotron radiation." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY034/document.
Повний текст джерелаSynchrotron radiation is one of the key factors for the tremendous success of macromolecular crystallography during the past decades. More than 90 % of all protein structures in PDB database were solved by crystallography using synchrotron radiation sources and around 95 % of them were determined from cryocooled crystals1,2. A whole data set can be collected from one flash-cooled crystal. Data-collection at cryogenic temperatures drastically reduces radiation damage effects. However, structures determined using cryo freezing techniques are limited by static nature of frozen crystals.With the recent development of X-ray free-electron laser facilities (XFELs), which are able to produce extremely intense femtosecond X-ray pulses, the era of “Diffraction before destruction” and serial femtosecond crystallography (SFX) for micro-/nano-sized crystals has begun3. In the SFX technique a protein crystal is only exposed once to the X-ray beam for tens of femtoseconds before it is completely destroyed. The data is collected from randomly oriented crystals that are exposed to the X-ray beam; only one shot per crystal is possible. In order to receive a complete data set, new data analysis techniques that are capable of dealing with large quantities of diffraction data have been developed. First experiment where serial femtosecond crystallography (SFX) approach was first carried out was performed at the Linac Coherent Light Source (LCLS, Stanford, USA) in December 2009 on photosystem I and lysozyme crystals4,5,6. At XFELs facilities crystallographers can perform room temperature structure determination of proteins almost free of radiation damage, due to the fact that femtosecond flashes of FEL is so brief, that it passes through the sample before the significant radiation damage occurs.After presenting first successful experiments with SFX technique, efforts to perform serial crystallography of micron-sized crystals at room-temperature started at synchrotron sources. First attempt to perform synchrotron room-temperature serial crystallography has been done at PETRA III at DESY in Hamburg using glass capillary based microfluidics7. This method was named synchrotron serial millisecond crystallography (SMX), where thousands of patterns are collected from individual crystals passing through the X-ray beam8. With development of room-temperature serial crystallography techniques at the synchrotrons, the exposure distributed on a large number of crystals in the sample, which helps compensating the effect of increased radiation damage at ambient temperature.Although synchrotron sources most certainly will never reach the same brightness of X-ray pulses like XFELs, they have some advantages. One of them is possibility to perform any set up due to the flexibility of the parameters of microfocus beamlines. Another advantage of SMX is that several shots per crystals are possible. Also should be mentioned that synchrotrons are more widespread all over the world, so possibility to get a beamtime at the synchrotron is much higher than at XFELs, because currently only two XFEL facilities are open for users (LCLS, USA and SACLA, Japan).The aim of this dissertation is to propose and to implement methods that will allow to collect data using the serial crystallography approach at the European synchrotron radiation facility (ESRF, Grenoble, France). This dissertation presents different techniques to perform synchrotron serial crystallography at ID13 beamline. The goal was to develop synchrotron serial crystallography based on scanning micro-diffraction to demonstrate that synchrotron sources can be used as a routine instrument to perform serial crystallography with soluble and membrane proteins. The aspects of the data collection and data processing also will be discussed
Eypper, Marie. "Photoionisation studies of reactive intermediates with synchrotron radiation." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/191337/.
Повний текст джерелаManfredda, M. "PROBING SYNCHROTRON RADIATION COHERENCE: THE HETERODYNE SPECKLE APPROACH." Doctoral thesis, Università degli Studi di Milano, 2012. http://hdl.handle.net/2434/172631.
Повний текст джерелаÁlvarez, Ruiz Jesús. "Photon induced fluorescence studies of molecules using synchrotron radiation." Licentiate thesis, KTH, Physics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1567.
Повний текст джерелаThis Licentiate thesis presents research accomplished at theSection of Atomic and Molecular Physics at the Royal Instituteof Technology in Stockholm using photon induced fluorescencespectroscopy (PIFS) during the last two years.
The main results presented are summarized:
- Neutral photodissociation in CO was observed aftersynchrotron photon excitation in the range 19-26 eV bycollecting dispersed fluorescence from excited neutral C atoms.Follow-up ab initio calculations point out CO Rydberg seriesconverging to the CO+ C and D states as precursors.
- The branching ratio between N2 + (B-X)(v=1,v=2) and (v=0,v=1)transitions in the 20-46 eV energy range reveals strongnon-Franck-Condon effects. Ab initio calculations indicate thatthe autoionization of certain superexcited states areresponsible for some of the structures present in the branchingratio curve, confirming the important role of non-Rydbergdoubly excited resonant states (NRDERS) in de-excitationprocesses above the ionization potential.
- Photon induced neutral dissociation processes in NO arereported. Neither Rydberg series nor other molecular states inNO known so far can account for the collected data. From abinitio calculations more information regarding the NO precursorstates and the mechanism behind the observed neutraldissociation were obtained.
- The details of a new experimental set-up for gas phasefluorescence measurements using synchrotron radiation aredescribed. It is able to perform simultaneous measurements ofdispersed and total fluorescence in the visible range. Thefirst results obtained with this set-up are presented,concerning fluorescence after excitation of the N2 molecules inthe N 1s edge.
These four studies conform the set of papers enclosed in theLicentiate thesis.
Finally a pre-study to further apply PIFS to speciespreviously excited by microwave discharge is included as futureplans.
Rius, i. Riu Jaume. "Gas phase molecular relaxation probed by synchrotron radiation experiments." Doctoral thesis, KTH, Physics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3411.
Повний текст джерелаThis thesis presents experimental studies of gas phasemolecular relaxation after excitation with synchrotron photonsin the 15-35 eV and in the 70-350 eV regions.
In the 15-35 eV region, molecular relaxation by neutraldissociation processes and non
Franck-Condon effects in N2 and O2 molecules have beenstudied by means of dispersed fluorescence and photoelectronspectroscopy experimental techniques, respectively. From thedispersed fluorescence data, excitation functions for themeasured atomic fluorescence spectra have been obtained. Fromthe recorded photoelectron spectra vibrational branching ratioshave been produced. The results obtained reveal that Rydbergseries and singly and doubly excited valence states of theappropriate symmetry energetically accessible in the studiedregion and interactions between themaccount for most of theobserved effects in these two type of experiments.
In the 70-350 eV range, molecular relaxation processesresulting in fragmentation of CD4 and SF6 after absorption ofsynchrotron light have been studied by energy resolved electronion coincidence technique using a multicoincidence experimentalstation developed by our group during the last five years forsuch type of experiments. The coincidence measurements yieldedmass spectra from which information about the kinematics of thedetected fragments has been deduced by means of Monte Carlosimulations of the experimental peak shapes. The obtainedresults show completely different dissociation patternsdepending on the molecular electronic states studied. Thesepatterns reflect the bonding properties of the excited orbitalsand they permit the description and in some cases theidentification of the different molecular relaxation pathwaysobserved. The achievements presented in this thesis exemplifythe potential of the multicoincidence station used in thereported experiments.
Vall-Llosera, Gemma. "Flourescence properties of trendy molecules studied with synchrotron radiation." Licentiate thesis, KTH, Physics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4148.
Повний текст джерелаThis thesis summarises the experimental results on molecular spectroscopy of gas phase molecules using synchrotron radiation in the UV- VUV and soft-X rays regions. The results of applying Photon Induced Fluorescence Spectroscopy (PIFS) to D2, H2S, H2O and pyrimidine are presented and discussed. Both inner and outer shell excitations of free molecules lead to different relaxation processes. However, a common result is that when the molecule breaks and the resulting neutral fragments are left in an excited state, they might fluoresce in the UV- Vis range. PIFS technique has two main advantages, it permits to detect neutral fragments and to identify the fluorescing species. From this fact, we can infer dissociation channels and trace back the electronic processes that led to the fluorescence. For these molecules we have analysed and interpreted both dispersed and undispersed fluorescence. What motivates our work is the lack of fluorescence studies and in a more general sense, to contribute to the knowledge of important molecules for life such as water and pyrimidine.
Álvarez, Ruiz Jesús. "Synchrotron radiation induced fluorescence spectroscopy of gas phase molecules." Doctoral thesis, KTH, Physics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-43.
Повний текст джерелаA new experimental set-up for gas phase fluorescence studies using synchrotron radiation has been designed and constructed to perform simultaneously total and dispersed fluorescence measurements.
Neutral photodissociation of CO has been investigated after excitation with 19-26 eV photons. Fluorescence from 3p 3P, 3p 3S and 3p 1D excited states in carbon was recorded and interpreted by ab initio calculations. The population and dissociation of states belonging to the C and D Rydberg series in CO seem to explain the production of the observed triplet states but not the 3p 1D state.
Neutral photodissociation of NO is reported in the 17-26 eV energy range. No known molecular states can account for the collected data. New information regarding the precursor states of the observed neutral dissociation is provided by ab initio calculations.
Autoionization of superexcited states in molecular nitrogen is evidenced by strong deviations of the Franck-Condon ratio in the fluorescence of the N2+ B state. Ab initio calculations predict the existence of autoionizing-excited states that may account for some of the observed structures in the 20-46 eV energy range.
Selective molecular fluorescence from the npó1Óu+ and npð 1Ðu (n=3-7) Rydberg levels to the E,F 1Óg+ state in H2 was recorded and rotationally analyzed. Vibrational levels of the E,F 1Óg+ state (vEF =0,1,3,6-10) are determined. The predissociation of npð 1Ð+ levels is observed in agreement with the literature.
Fragmentation of SF6 was investigated after excitation with 25–80 eV photons. Dispersed fluorescence measurements reveal the emission of S, S+, F and F+ excited atoms. These fragments are produced after single, double and triple excitations as well as direct ionizations and shake-ups in SF6.
Photoabsorption and fluorescence yield have been measured in SF5CF3 using 10-30eV photons. The photoabsorption spectrum can be explained in terms of its similarities to those of the SF6 and CF4 molecules. The dispersed and un-dispersed fluorescence resemble those of the CF3X family. Several features suggest the migration of an F atom across the S-C bond that fragments the molecule producing excited CF4.
Doubly excited states of H2 have been investigated in the range of 26-60 eV by monitoring Balmer á emission. The experimental data show the already known emission correlated with the fragmentation of the Q1 and Q2 states, and new features which could be attributed to dissociative photoionization and higher lying doubly excited states Qn (n>2) of the hydrogen molecule
Studniarek, Michal. "Interface and multifunctional device spintronics : studies with synchrotron radiation." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAE028/document.
Повний текст джерелаMultifunctional spintronics is a new direction of advancement beyond the limits of modern electronics. By combining elementary charge of an electron and its spin, it aims to develop devices which would be sensitive to more than one stimuli and/or have multiresponse signal. In this thesis, we explore the multifunctional potential emerging while combining spin electronic and organic systems to pave the way towards multipurpose devices. First, we study formation of a ferromagnetic/organic spinterface in Co/manganese-phthalocyanine system. We propose introduction of intrinsic multifunctionality by using spin crossover materials. We develop a novel functionalization approach for tuning their properties towards device applications. We propose an external functional control over any hybrid spinterface by using multiferroic substrate. In the framework of this thesis, a Versatile Variable Temperature Insert was developed at the DEIMOS beamline of the SOLEIL synchrotron. We demonstrate how it can be used to probe active atoms in any microelectronic device
Vall-Llosera, Gemma. "Fluorescence properties of trendy molecules studied with synchrotron radiation /." Stockholm : School of Engineering Sciences, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4148.
Повний текст джерелаMartin, Ian Peter Stephen. "Short pulse x-ray generation in synchrotron radiation sources." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:9ac0bcc2-bedb-46d0-b95c-22f4741f45a0.
Повний текст джерелаGrant, James Paul. "GaN radiation detectors for particle physics and synchrotron applications." Thesis, University of Glasgow, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443418.
Повний текст джерелаCheetham, Graham M. T. "Applications of synchrotron radiation in single crystal structure analysis." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333690.
Повний текст джерелаRule, Robert J. "Studies related to crystal growth using synchrotron radiation diffraction." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291738.
Повний текст джерелаKeen, Anthony Mark. "Nanoscale manganese structures on graphite studied using synchrotron radiation." Thesis, University of Leicester, 1996. http://hdl.handle.net/2381/35707.
Повний текст джерелаHandrup, Karsten. "Synchrotron radiation based studies of complex molecules on surfaces." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/13988/.
Повний текст джерелаDaley, T. E. "Advanced characterisation of catalytic materials using synchrotron radiation techniques." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1468758/.
Повний текст джерелаZhang, Teng. "Synchrotron radiation study of free and adsorbed organic molecules." Licentiate thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-307787.
Повний текст джерелаLopez, Frances Caroline. "Single photon counting system for mammography with synchrotron radiation." Doctoral thesis, Università degli studi di Trieste, 2013. http://hdl.handle.net/10077/8581.
Повний текст джерелаDigital imaging systems for medical applications must be based upon highly efficient detectors to ensure low patient dose. This is considerably important, especially in mammography, because the high sensitivity of the breast to radiation. A mammoraphy system must also provide high spatial and contrast resolution to be able to detect important structures related to breast malignancies. The work performed and described in this thesis is the development of a readout system for a detector optimised for clinical mammography with synchrotron radiation. The detector called PICASSO (Phase Imaging for Clinical Application with Silicon detector and Synchrotron radiatiOn) is developed mainly for the mammography station of the SYRMEP beamline. The detector described in this work is based on Silicon microstrip sensors that are illuminated edge-on. The incoming beam impinging the detector is parallel to the strips of its sensors. This configuration permits high detection efficiency in the energy range that is of interest for mammography. Moreover, the Silicon sensors also allow direct conversion of X-rays. The readout electronics of the Picasso detector works on single-photon counting mode. That is, only signals from photons that are equal or greater than a pre-set threshold are counted, and low freqency noise are automatically rejected. The visibility of small details, normally valuable in mammograms, are maximised because the system is quantum limited, ie, the quality of the image is limited only by the intrinsic fluctuation of the detected photons. Picasso has four layers, each containing three detector modules. The layers are grouped into pairs and arranged one in front of the other along the beam of propagation. The pairs are controlled separately but are working in parallel. The system is a modular detector that implements a read-out system with MYTHEN II ASICs, an embedded Linux-based controller board and a Scientific Linux acquisition workstation. The developed system architecture and its characteristics will be presented. Preliminary imaging tests were perfomed and results with the new system will be presented. Standard mammographic phantoms were imaged and good quality images were obtained at doses comparable with what is delivered in conventional full field mammographic systems. The whole system was able to sustain fast acquisition speeds up to 10ms/frame and runs stable until a breast-equivalent length acquisition is accomplished. A delay between frame of 150μs and delay between controllers of around 750μs is achieved. Phase-contrast imaging has revolutionized the face of mammography with synchrotron radiation in the last ten years as the first clinical phase has been successfully implemented in our facility. This initial step made use of commercial screen-film system producung promising results. Thanks to the coherence and monochromaticity of light coming from synchrotron sources that edge-enhancement in the image is achieved due to phase effects. The compatibility of the Picasso detector to phase-contrast imaging with other novel techniques has also been evaluated in line with this project. Phase-contrast was well demonstrated with the system, details of which will be fully described.
XXV Ciclo
1980
Cheng, Yin [Verfasser], and Ingo [Akademischer Betreuer] Krossing. "In situ synchrotron radiation computed laminography for materials failure analysis = In-situ Synchrotron-Laminographie für Materialfehleranalyse." Freiburg : Universität, 2013. http://d-nb.info/1123479097/34.
Повний текст джерелаCaló, A. (Antonio). "Electron spectroscopy of atoms and molecules using synchrotron radiation, UV radiation and electron impact." Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514286650.
Повний текст джерелаDuxbury, Dominic Mark. "Novel X-ray imaging detectors." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243037.
Повний текст джерелаBostedt, Christoph. "Electronic structure of germanium nanocrystal films probed with synchrotron radiation." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964891069.
Повний текст джерелаNguti, N. D. "Laue and anomalous diffraction studies in synchrotron radiation protein crystallography." Thesis, Keele University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295803.
Повний текст джерелаMelero, Garcia Emilio. "Synchrotron radiation spectroscopy of molecular dynamics beyond the valence shell." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3899.
Повний текст джерелаSakata, M., S. Aoyagi, T. Ogura, and E. Nishibori. "Advanced Structural Analyses by Third Generation Synchrotron Radiation Powder Diffraction." American Institite of Physics, 2007. http://hdl.handle.net/2237/12008.
Повний текст джерелаNISHINO, YOICHI, SHINYA YAGI, MASAHIKO KATO, MANABU INUKAI, TAKAHIRO MOCHIZUKI, KOJI YAMAMOTO, HIDETOSHI MIYAZAKI, and KAZUO SODA. "SYNCHROTRON RADIATION PHOTOELECTRON STUDY OF HEUSLER-TYPE Fe2VAL-BASED ALLOYS." World Scientific Publishing, 2008. http://hdl.handle.net/2237/20772.
Повний текст джерелаBebb, Andrew M. "Synchrotron radiation studies of spin-polarised electron momentum density distributions." Thesis, University of Warwick, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404845.
Повний текст джерелаMaginn, Stephen James. "Applications of synchrotron radiation Laue diffraction in molecular structure studies." Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253418.
Повний текст джерела梁寶鎏 and Po-lau Leung. "Special features of cyclotron, synchrotron and Čerenkov radiations in anisotropic plasmas." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31231871.
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