Teses / dissertações sobre o tema "Charge excitations"
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Waidacher, Christoph. "Charge properties of cuprates: ground state and excitations". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2000. http://nbn-resolving.de/urn:nbn:de:swb:14-998985918593-73513.
Texto completo da fonteWaidacher, Christoph. "Charge properties of cuprates: ground state and excitations". Doctoral thesis, Technische Universität Dresden, 1999. https://tud.qucosa.de/id/qucosa%3A24786.
Texto completo da fonteLorin, Arnaud. "Electronic properties of silver chloride : influence of excitons on the charge dynamics". Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX087.
Texto completo da fonteIn 1848, Edmond Becquerel proposed one of the first techniques of color photography. This technique raised a long-standing debate in the scientific community concerning the origin of the observed colors. In 2019, Victor de Seauve, during his thesis at the Muséum National d'Histoire Naturelle in Paris, could clarify some important issues, proposing a new explanation. The aim of the present thesis was to participate in this effort of comprehension, by adding theoretical insight. The first question is which level of theory one may adopt in order to correctly describe the electronic and optical properties of AgCl. Our calculations show that only the solution of the Bethe-Salpeter equation is able to describe the optical spectrum of AgCl, since the spectrum is dominated by a strong peak at the absorption onset, due to a bound exciton. Moreover, the calculation has to be based on a band structure that results from a self-consistent GW calculation. In order to make the Bethe-Salpeter calculations possible, a previously proposed model dielectric function was used in an improved way. Our results well describe the measured absorption spectra, and enable us to analyse and interpret the observations. In the hypothesis brought forward by the team at the Museum, the light excites a silver nanoparticle, followed by a transfer of charge at the interface between the nanoparticle and AgCl. In order to be able to study this phenomenon, we have developed a numerical approach describing the charge dynamics due to an external perturbation. In particular, this approach has allowed us to show that a bound exciton influences the charge dynamics significantly. Finally, we have set up a first model meant to simulate the charge transfer between a silver nanoparticle and AgCl, based on a simplified heterostructure. We have shown how the absorption spectrum of AgCl changes due to its neighbourhood to the silver metal, and how these changes can be described by the effective medium theory. Calculations of the density induced by a periodic perturbation have been carried out. These calculations remain cumbersome, and the study will continue with the idea to combine ab initio calculations with effective medium theory
Liang, H. "Nuclear charge-exchange excitations in a self-consistent covariant approach". Phd thesis, Université Paris Sud - Paris XI, 2010. http://tel.archives-ouvertes.fr/tel-00506913.
Texto completo da fonteRubio, Pons Oscar. "Charge-transfer excitations and phtophysical properties of molecular building blocks". Doctoral thesis, KTH, Teoretisk kemi (stängd 20110512), 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-184.
Texto completo da fonteQC 20101011
Rubio, Pons Óscar. "Charge-transfer excitations and photophysical properties of molecular building blocks /". Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-184.
Texto completo da fonteLiang, Haozhao. "Nuclear charge-exchange excitations in a self-consistent covariant approach". Paris 11, 2010. http://www.theses.fr/2010PA112178.
Texto completo da fonteNowadays, charge-exchange excitations in nuclei become one of the central topics in nuclear physics and astrophysics. Basically, a systematic pattern of the energy and collectivity of these excitations could provide direct information on the spin and isospin properties of the in-medium nuclear interaction, and the equation of state of asymmetric nuclear matter. Furthermore, a basic and critical quantity in nuclear structure, neutron skin thickness, can be determined indirectly by the sum rule of spin-dipole resonances (SOR) or the excitation energy spacing between the isobaric analog states (lAS) and Gamow-Teller resonances (GTR). More generally, charge-exchange excitations allow one to attack other kinds of problems outside the realm of nuclear structure, like the description of neutron star and supernova evolutions, the β-decay of nuclei which lie on the r-process path of stellar nucleosynthesis, and the neutrino-nucleus cross sections. They also play an essential role in extracting the value of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element Vud via the nuclear 0+→ 0 + superallowed Fermi β decays. For all these reasons, it is important to develop the microscopic theories of charge-exchange excitations and it is the main motivation of the present work. Ln this work, a fully self-consistent charge-exchange relativistic random phase approximation (RPA) based on the relativistic Hartree-Fock (RHF) approach is established. Its self-consistency is verified by the so-called lAS check. This approach is then applied to investigate the nuclear spin-isospin resonances, isospin symmetry-breaking corrections for the superallowed β decays, and the charged-current neutrino-nucleus cross sections. For two important spin-isospin resonances, GTR and SOR, it is shown that a very satisfactory agreement with the experimental data can be obtained without any readjustment of the energy functional. Furthermore, the isoscalar mesons are found to play an essential role in spin-isospin resonances via the exchange terms, which leads to a profound effect in the nuclear isovector properties, e. G. , the density dependence of the symmetry energy in nuclear matter. Ln the investigation of the isospin symmetry-breaking corrections for the superallowed β decays, it is found that the corrections δc are sensitive to the proper treatments of the Coulomb mean field, but not so much to specific effective interactions. With these corrections δc, the nucleus-independent Ft values are obtained in combination with the experimental ft values in the most recent survey and the improved radiative corrections. The values of Cabibbo-Kobayashi-Maskawa matrix element IVudI thus obtained weil agree with those obtained in neutron decay, pion decay, and nuclear mirror transitions, while the sum of squared top-row elements somehow deviates from the unitarity condition. Expressing the weak lepton-hadron interaction in the standard current-current form, the relevant transitions from the nuclear ground state to the excited states are calculated with RHF+RPA approach. Ln this way, the semileptonic weak interaction processes, e. G. , neutrino reactions, charged- lepton capture, β-decays, can be investigated microscopically and self-consistently. First illustrative calculations of the inclusive neutrino-nucleus cross section are performed for the 16 O(Ve ,e-)16 F reaction, and a good agreement with the previous theoretical studies is obtained. The main effort is dedicated to discussing the substantial influence of different recipes for the axial vector coupling strength and the theoretical low-Iying excited states of the daughter nucleus
Tegomo, Chiogo Bodry. "Spectroscopic studies of cerium and Ytterbium-based Kondo systems". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0193.
Texto completo da fonteCerium and ytterbium compounds are systems that exhibit outstanding magnetic, electronic, and thermodynamic properties at low temperatures, such as the Kondo effect, heavy fermions, intermediate valence, and charge density waves. These properties are due to the very strong electron-electron interactions of the f states and the hybridization of the f states with the conduction electrons. In the first part of this thesis work, we investigate the temperature-dependent electronic structure of YbPd, a Kondo mixed-valent cubic compound at high temperature, which exhibits incommensurate and commensurate charge-density-wave (CDW) ordering below T_1 = 130 K and T_2 = 105 K, respectively. Below 105 K, magnetic Yb^{3+} and nonmagnetic Yb^{2.6+} are arranged alternatively along the c axis, in a tetragonal structure exhibiting valence order. Hard x-ray photoemission spectroscopy of Yb 3d states show temperature-independent Yb^{2+} and Yb^{3+} features indicating single-Yb site dynamic valence fluctuations above T_1, and a clear temperature dependent valence change of the two crystallographic Yb sites in the CDW phase. Simplified single-impurity Anderson model calculations of the Yb 3d states show good agreement with the temperature-dependent valency change and provide site-dependent Kondo temperatures. The results indicate an evolution from dynamic mixed-valence in the cubic phase to long-range static CDW order in the tetragonal phase, which is driven by the difference in Kondo energies of the two phases. Resonant inelastic x-ray scattering (RIXS) is a very efficient technique to study elementary excitations in a large variety of systems, such as charge transfer excitations, the crystal field, and spin-orbit excitations. In the second part of this work, we investigated cerium compounds with different Kondo temperatures using RIXS at Ce M_5-edge combined with simulation using the full multiplet theory and the single impurity Anderson model. We demonstrated that all the charge excitations observed in combined photoemission and inverse photoemission can be evidenced by RIXS spectroscopy just by varying the incident photon energy around the Ce M_5-edge. We also discuss the drastic polarization dependence of the f^0 structure in RIXS spectra and the strong temperature dependence of the fluorescence-like structure, which is reminiscent of the temperature dependence of the Kondo resonance
Falck, Jens Petter. "Polaronic charge carriers and their optical excitations in insulating La₂CuO₄ây̳". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12450.
Texto completo da fonteFew, Sheridan. "Theoretical studies of charge transfer excitations, absorption, and polarisation in organic photovoltaic materials". Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/33284.
Texto completo da fonteKapfer, Maëlle. "Dynamic of excitations of the Fractional quantum Hall effect : fractional charge and fractional Josephson frequency". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS393/document.
Texto completo da fonteIn some quantum matter states, the current may remarkably be transported by carriers that bear a fraction e* of the elementary electron charge. This is the case for the Fractional quantum Hall effect (FQHE) that happens in two-dimensional systems at low temperature under a high perpendicular magnetic field. When the number of magnetic flux in units of h/e is a fraction of the number of electron, a dissipationless current flows along the edges of the sample and is carried by anyons with fractional charge. The observation of the fractional charge is realized through small current fluctuations produced by the granularity of the charge. Here is presented a reliable method to measure the fractional charge by the mean of cross-correlation of current fluctuations. Moreover, the dynamical properties of those charges is probed when the sample is irradiated with photos at GHz frequency. The long predicted Josephson frequency of the fractional charge is measured. Those measurements validate Photoassisted processes in the FQHE and enable timedomain manipulation of fractional charges in order to realize a single anyon source based on levitons to perform tests of the anyonic statistics of fractional charge
Harrison, Mark Geoffrey. "The charge excitations of conjugated polymers and oligomers : optical and electrical studies within field-effect devices". Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360905.
Texto completo da fonteBaniya, Sangita, Shai R. Vardeny, Evan Lafalce, Nasser Peygambarian e Z. Valy Vardeny. "Amplitude-Mode Spectroscopy of Charge Excitations in PTB7 π-Conjugated Donor-Acceptor Copolymer for Photovoltaic Applications". AMER PHYSICAL SOC, 2017. http://hdl.handle.net/10150/625067.
Texto completo da fonteStaresinic, Damir. "Contribution à l'étude des excitations de basse énergie dans les systèmes quasi-unidimensionels". Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10221.
Texto completo da fonteFreeman, Paul Gregory. "Magnetism and the magnetic excitations of charge ordered La_(₂_-_x_)Sr_(_x_)NiO_(₄₊_δ_)". Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418806.
Texto completo da fonteReschke, Stephan [Verfasser], e István [Akademischer Betreuer] Kézsmárki. "Optical excitations of spin, lattice and charge degrees of freedom in multiferroics / Stephan Reschke ; Betreuer: István Kézsmárki". Augsburg : Universität Augsburg, 2020. http://d-nb.info/1227840446/34.
Texto completo da fonteBöttge, Christoph N. [Verfasser], e Mackillo [Akademischer Betreuer] Kira. "On the Phonon Interactions and Terahertz Excitations among Coulomb-correlated Charge Carriers of Semiconductors / Christoph N. Böttge. Betreuer: Mackillo Kira". Marburg : Philipps-Universität Marburg, 2013. http://d-nb.info/1043316590/34.
Texto completo da fonteCollart, Emilie. "Excitations électroniques dans les matériaux fortement corrélés: l'apport de la diffusion inélastique résonante des rayons X". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2005. http://tel.archives-ouvertes.fr/tel-00113361.
Texto completo da fonteDans les monoxydes, nous avons étudié les excitations localisées du champ cristallin. Dans La2CuO4, et La2NiO4, nous avons plus particulièrement étudié les excitations de transfert de charge. Un exciton (état lié électron-trou) a été observé dans les deux matériaux avec cependant une dynamique différente. Dans La2CuO4, l'exciton a un comportement dispersif alors que dans La2NiO4, il est localisé par les corrélations antiferromagnétiques. Un modèle invoquant la formation d'un singulet de Zhang et Rice dans le cuprate a été proposé pour expliquer cette dynamique excitonique dans le réseau antiferromagnétique sous-jacent.
Gougoussis, Christos. "Excitations électroniques et magnétisme des matériaux : clacul ab initio de l'absorption X et du dichroïsme circulaire magnétique au seuil K". Paris 6, 2009. http://hal.upmc.fr/tel-01336855.
Texto completo da fonteCollart, Emilie. "Excitations électroniques dans les matériaux fortement corrélés : l' apport de la diffusion inélestique résonante des rayons X". Paris 6, 2005. https://tel.archives-ouvertes.fr/tel-00113361.
Texto completo da fonteKHOUDIR, AHMED. "Contribution a l'etude theorique des effets de substitution sur les transferts de charge et les excitations de cur : molecules isolees ou en interaction avec des agregats de metaux de transition". Paris 7, 1999. http://www.theses.fr/1999PA077124.
Texto completo da fonteNovelli, Fabio. "In search of selective excitations for studying out-of-equilibrium properties in strongly correlated electron systems and high temperature superconductors". Doctoral thesis, Università degli studi di Trieste, 2013. http://hdl.handle.net/10077/8588.
Texto completo da fonteNegli ossidi dei metalli di transizione le correlazioni elettroniche, magnetiche e reticolari sono all’origine di peculiari proprietà fisiche come la resistenza magnetica colossale e la superconduttività ad alta temperatura critica. La spettroscopia risolta in tempo è uno strumento unico per separare il contributo dei singoli gradi di libertà. Inoltre, tale tecnica può essere usata per indurre transizioni di fase non-termiche nella materia condensata. In particolare, scegliendo appositi impulsi pompa in combinazione con impulsi sonda in grado di misurarne gli effetti, è possibile “guidare” la materia nello stato fisico desiderato tramite un’eccitazione selettiva. I primi capitoli della tesi introducono lo stato dell’arte, le tecniche sperimentali e i modelli usati per studiare le proprietà ottiche dei cristalli fuori equilibrio. I capitoli successivi sono dedicati a singoli materiali: abbiamo eseguito misure di riflettività risolte in tempo con pompa nel visibile e sonda ad ampio spettro (1-3 eV) su alcuni isolanti di Mott (YVO3 e La2CuO4) e superconduttori (YBa2Cu3O7-d), e con pompa THz (1 THz~4 meV) su GaAs. YVO3 è un prototipico isolante di Mott e mostra una varietà di fasi caratterizzate da peculiari ordini orbitali e magnetici in funzione della temperatura. In questo sistema le eccitazioni ottiche sono direttamente collegate al grado di libertà orbitale, magnetico o elettronico, ma la loro interpretazione è controversa. Eseguendo misure di riflettività risolte in tempo e frequenza abbiamo dimostrato che le due transizioni ottiche ad energie minori (1.8 eV e 2.4 eV) appartengono alla stessa banda: in particolare, la transizione a 1.8 eV è interpretabile come un eccitone di Hubbard, ovvero uno stato quasi legato stabilizzato da una diminuzione di energia cinetica. Inoltre, abbiamo suggerito l’interpretazione della fase metastabile (che sopravvive almeno fino a 1 ns dopo la foto-eccitazione) come una fase disordinata di spin, e che il materiale potrebbe pertanto essere utilizzato come interruttore magnetico ultra-veloce (F.Novelli et al., Phys. Rev. B 86, 165135, 2012). Per studiare la dipendenza della risposta ottica transiente dei cuprati dalla lunghezza d’onda della pompa ci siamo concentrati sul La2CuO4. I nostri risultati dimostrano che l’effetto degli impulsi di pompa non può sempre essere trattato come semplice perturbazione della temperatura del sotto-sistema elettronico, poiché dinamiche molto diverse vengono rivelate quando l’energia degli impulsi di pompa è maggiore o minore dell’energia del gap di trasferimento di carica, che si trova a circa 2 eV. In particolare foto-eccitare sopra gap è analogo ad un aumento di temperatura, mentre foto-eccitare sotto gap “indurisce” il gap di trasferimento di carica. Ciò suggerisce l’esistenza di eccitazioni a bassa energia che inducono una rinormalizzaizione non termica del gap (in preparazione). Per studiare l’interazione fra grado di libertà vibrazionale e grado di libertà elettronico nei sistemi a forte correlazione elettronica abbiamo utilizzato impulsi di pompa con lunghezza d’onda centrale pari a 800 nm e impulsi di sonda nell’intervallo 400-1200 nm su film sottili di YBa2Cu3O7-d drogato in modo ottimale. Le oscillazioni della riflettività transiente palesano due fononi con frequenze di pochi THz che coinvolgono rispettivamente vibrazioni, pressoché pure, di Ba e Cu. Mentre il modo del rame è indipendente, il modo del bario risulta chiaramente accoppiato alla fase superconduttiva. L’ampiezza delle oscillazioni del modo del bario aumenta sotto la temperatura critica e la sua distribuzione spettrale è modificata quando il condensato viene sciolto dagli impulsi di pompa. I nostri risultati offrono una nuova prospettiva nell’interpretazione della dinamica delle transizioni inter-banda dei cuprati che subiscono forti modificazioni sotto TC (in preparazione). Abbiamo studiato un regime misto nell’interazione fra luce e materia tramite misure risolte in fase dell’effetto Franz-Keldysh nell’arseniuro di gallio. L’effetto Franz-Keldysh consiste nella perturbazione delle proprietà ottiche di un semiconduttore in una regione energetica intorno al gap a seguito dell’applicazione di un campo elettrico. Le misure sono state effettuate con impulsi di pompa ultra corti a singolo ciclo ottico nella regione spettrale del terahertz, e impulsi di sonda ad ampio spettro nella regione spettrale del visibile. Regolando l’intensità degli impulsi di pompa abbiamo studiato sia l’effetto Franz-Keldysh dinamico che un nuovo regime di saturazione in cui la “memoria” è importante, ovvero in cui la risposta ottica intorno al gap dipende da una funzione integrale del campo elettrico applicato. I nostri risultati potrebbero essere utili nell’ambito della strumentazione ottica ultra-veloce (F. Novelli et al., Scientific Reports 3, 1227, 2013). In conclusione, abbiamo dimostrato che le eccitazioni selettive sono certamente possibili in diversi ossidi dei metalli di transizione tramite tecniche spettroscopiche ultra-veloci risolte in tempo e frequenza: importanti informazioni fisiche possono essere ottenute regolando il contenuto energetico degli impulsi laser utilizzati.
XXV Ciclo
1984
Hua, Ying. "Structures auto-assemblées de guanines étudiées par spectroscopie optique résolue en temps". Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00873695.
Texto completo da fonteCheng, Yuan-Chung Ph D. Massachusetts Institute of Technology. "Quantum dynamics in condensed phases : charge carrier mobility, decoherence, and excitation energy transfer". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/34496.
Texto completo da fonteVita.
Includes bibliographical references.
In this thesis, we develop analytical models for quantum systems and perform theoretical investigations on several dynamical processes in condensed phases. First, we study charge-carrier mobilities in organic molecular crystals, and develop a microscopic theory that describes both the coherent band-like and incoherent hopping transport observed in organic crystals. We investigate the structures of polaron states using a variational scheme, and calculate both band-like and hopping mobilities at a broad range of parameters. Our mobility calculations in 1-D nearest-neighbor systems predict universal band-like to hopping transitions, in agreement with experiments. Second, motivated by recent developments in quantum computing with solid-state systems, we propose an effective Hamiltonian approach to describe quantum dissipation and decoherence. We then applied this method to study the effect of noise in a number of quantum algorithms and calculate noise threshold for fault-tolerant quantum error corrections (QEC). In addition, we perform a systematic investigation on several variables that can affect the efficiency of the fault-tolerant QEC scheme, aiming to generate a generic picture on how to search for optimal circuit design for real physical implementations.
(cont.) Third, we investigate the quantum coherence in the B800 ring of' of the purple bacterium Rps. acidophila and how it affects the dynamics of excitation energy transfer in a single LH2 complex. Our calculations suggest that the coherence in the B800 ring plays a significant role in both spectral and dynamical properties. Finally, we discussed the validity of Markovian master equations, and propose a concatenation scheme for applying Markovian master equations that absorbs the non-Markovian effects at short times in a natural manner. Applications of the concatenation scheme on the spin-boson problem show excellent agreements with the results obtained from the non-Markovian master equation at all parameter range studied.
by Yuan-Chung Cheng.
Ph.D.
Acharya, Khem. "Excitation energy transfer and charge separation dynamics in photosystem II: hole-burning study". Diss., Kansas State University, 2012. http://hdl.handle.net/2097/13600.
Texto completo da fonteDepartment of Chemistry
Ryszard J. Jankowiak
The constituents of oxygen-evolving photosystem II core complexes—antenna proteins (CP43 and CP47) and reaction center (RC)—have been the subject of many studies over the years. However, the various issues related to electronic structure, including the origin/composition of the lowest-energy traps, origin of various emission bands, excitation energy transfer (EET), primary charge separation (CS) processes and pigment site energies remain yet to be fully resolved. Exploiting our state-of-the-art techniques such as low-T absorption, fluorescence, and hole burning (HB) spectroscopies, we resolved some of the issues particularly related to CP47 and isolated RC protein complexes. For example, we demonstrated that the fluorescence origin band maximum (~695 nm) originates from the lowest-energy state ~693 nm of intact CP47. In intact CP47 in contrast to destablished protein complexes, the band (~695 nm) does not shift in the temperature range of 5–77 K unless hole-burning takes place. We also studied a large number of isolated RC preparations from spinach, and wild-type Chlamydomonas reinhardtii (at different levels of intactness), as well as its mutant (D2-L209H), in which the active branch pheophytin (PheoD1) has been genetically replaced with chlorophyll a (Chl a). We showed that the Qx-/Qy-region site-energies of PheoD1 and PheoD2 are ~545/680 nm and ~541.5/670 nm, respectively, in good agreement with our previous assignment [Jankowiak et al. J. Phys. Chem. B 2002, 106, 8803]. Finally, we demonstrated that the primary electron donor in isolated algal RCs from C. reinhardtii (referred to as RC684) is PD1 and/or PD2 of the special Chl pair (analogous to PL and PM, the special BChl pair of the bacterial RC) and not ChlD1. However, the latter can also be the primary electron donor (minor pathway) in RC684 depending on the realization of the energetic disorder. We further demonstrate that transient HB spectra in RC684 are very similar to P+QA - PQA spectra measured in PSII core, providing the first evidence that RC684 represent intact isolated RC that also possesses the secondary electron acceptor, QA. In summary, a new insight into possible charge separation pathways in isolated PSII RCs has been provided.
Gieseking, Björn [Verfasser], e Vladimir [Gutachter] Dyakonov. "Excitation Dynamics and Charge Carrier Generation in Organic Semiconductors / Björn Gieseking. Gutachter: Vladimir Dyakonov". Würzburg : Universität Würzburg, 2014. http://d-nb.info/1109750048/34.
Texto completo da fonteOrliange, Isabelle. "Mesures de pouvoirs d'arrêt des gaz pour les ions lourds de 3 à 13 MeV par nucléon". Paris 11, 1985. http://www.theses.fr/1985PA112225.
Texto completo da fonteThe stopping powers of gases have been measured for incident ¹⁰Ne, ¹⁸Ar, ²⁹Cu, ³⁶Kr and ⁴⁷Ag ions of 3 to 13 MeV/u. These measurements have confirmed the existence of a gas-solid difference for the stopping powers (the stopping power of solids being larger than that of gazes). Such a difference was theoretically postulated by Bohr and Lindhard in 1954, and experimentally observed for the first time by Geissel in 1982. This effect can be qualitatively interpreted by a difference in the ion’s effective charge in stopping power. However, the determination of charge state distribution for Ar and Fe ions in two particular cases (Ar + N₂s ou N₂g) and (Fe + Cs ou Cg) from a theoric model and experimental cross sections for atomic collisions don't quantitatively account for observed differences
Pugatschow, Anton. "Quantitative determination of electric field strengths within dynamically operated devices by modulated charge carrier excitation". Tönning Lübeck Marburg Der Andere Verl, 2007. http://d-nb.info/988422956/04.
Texto completo da fonteClouvas, Alexandre. "Excitation, ionisation et dissociation dans des cibles minces de projectiles atomiques et moléculaires et d'agrégats rapides dans le domaine hors équilibre de charge". Lyon 1, 1985. http://www.theses.fr/1985LYO10044.
Texto completo da fonteGerken, Nils Christian [Verfasser]. "XUV Multiphoton Excitation and Charged State Dynamics in Small Quantum Systems / Nils Christian Gerken". München : Verlag Dr. Hut, 2014. http://d-nb.info/1059329786/34.
Texto completo da fonteHofmann-Mees, Dirk [Verfasser], e Stephan [Akademischer Betreuer] Kümmel. "Charge and excitation-energy transfer in time-dependent density functional theory / Dirk Hofmann-Mees. Betreuer: Stephan Kümmel". Bayreuth : Universität Bayreuth, 2013. http://d-nb.info/1059353652/34.
Texto completo da fonteBouchama, Mohamed-Touffik. "Etude par spectroscopie UV de la capture électronique par des ions de charge 7 et 8 dans des cibles neutres". Lyon 1, 1988. http://www.theses.fr/1988LYO10106.
Texto completo da fonteLau, Chun-hung Barry, e 劉俊雄. "Excitation contraction coupling of ventricular myocyte in septicshock: role of a change in calcium cyclingsystem". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39558320.
Texto completo da fonteZiemann, Dirk. "Theory of Excitation Energy Transfer in Nanohybrid Systems". Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/22142.
Texto completo da fonteIn the following, transfer phenomena in nanohybrid systems are investigated theoretically. Such hybrid systems are promising candidates for novel optoelectronic devices and have attracted considerable interest. Despite a vast amount of experimental studies, only a small number of theoretical investigations exist so far. Furthermore, most of the theoretical work shows substantial limitations by either neglecting the atomistic details of the structure or drastically reducing the system size far below the typical device extension. The present thesis shows how existing theories can be improved. This thesis also expands previous theoretical investigations by developing models for four new and highly relevant nanohybrid systems. The first system is a spherical nanostructure consisting of an Au core and a CdS shell. By contrast, the second system resembles a finite nanointerface built up by a ZnO nanocrystal and a para-sexiphenyl aggregate. For the last two systems, a CdSe nanocrystal couples either to a pheophorbide-a molecule or to a tubular dye aggregate. In all of these systems, excitation energy transfer is an essential transfer mechanism and is, therefore, in the focus of this work. The considered hybrid systems consist of tens of thousands of atoms and, consequently, require an individual modeling of the constituents and their mutual coupling. For each material class, suitable methods are applied. The modeling of semiconductor nanocrystals is done by the tight-binding method, combined with a configuration interaction scheme. For the simulation of the molecular systems, the density functional theory is applied. T. Plehn performed the corresponding calculations. For the metal nanoparticle, a model based on quantized plasmon modes is utilized. As a consequence of these theories, excitation energy transfer calculations in hybrid systems are possible with unprecedented system size and complexity.
Ourdane, Mohamed Arezki. "Etude de l'influence du continuum à travers le couplage discret - continu pour le processus de transfert excitation aux hautes énergies d'impact". Metz, 1998. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1998/Ourdane.Mohamed_Arezki.SMZ9821.pdf.
Texto completo da fonteThe Transfer Excitation (TE) process in fast collisions has excited great interest. Through a 4 body formalism CDW-4B (Continuum Distorted Wave-Four Body), a special emphasis is given to a proper inclusion of electronic correlation effects. The comparison with the experimental data of Zouros et al (1988) confirm that interference between RTE (Resonant Transfer Excitation) and NTE (Non-resonant Transfer Excitations) modes may sometimes be important. However, some discrepancies and the existence of Fano profile in the helium autoionization spectra shows that other processes have to be considered. As a matter of fact, the ejected electron coming from the Auger decay of the formed doubly excited state of the projectile can not be distinguished from the ones du to a direct ionization or a transfer and ionization. Both processes belong to what we call Transfer Ionization (TI). Theoretically, it is the consequence of the coupling between the autoionization states and their adjacent continuum. Our main goal is to take in account the contribution of this continuum. The works made by Fano (1961) enables us to write the final state including this coupling. A procedure of discretization of its continuous part with Slater Type Orbitals respecting the normalization in energy is used. Four states of Helium are analyzed 2s2s 1S, 2s2p 1P, 2s2p 3P, 2p2p 1D and compared with the experimental data of Itoh et al (1985)
Guatieri, Francesco. "Production and excitation of cold Ps for anti-H formation by charge exchange: towards a gravitational measurement on antimatter". Doctoral thesis, Università degli studi di Trento, 2018. https://hdl.handle.net/11572/368611.
Texto completo da fonteGuatieri, Francesco. "Production and excitation of cold Ps for anti-H formation by charge exchange: towards a gravitational measurement on antimatter". Doctoral thesis, University of Trento, 2018. http://eprints-phd.biblio.unitn.it/2954/1/Tesi_V1_12Export.pdf.
Texto completo da fonteLau, Chun-hung Barry. "Excitation contraction coupling of ventricular myocyte in septic shock : role of a change in calcium cycling system /". Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39558320.
Texto completo da fonteKhelifa, Naceur-Eddine. "Transfert de charge entre atomes de rydberg excités par laser et agrégats moléculaires dans une expérience en jets croisés". Paris 13, 1992. http://www.theses.fr/1992PA132011.
Texto completo da fontePrice, Jack Lewis. "K-, L-, and M-Shell X-Ray Production Cross Sections for Beryllium, Aluminum and Argon Ions Incident Upon Selected Elements". Thesis, North Texas State University, 1986. https://digital.library.unt.edu/ark:/67531/metadc331170/.
Texto completo da fonteAmoako, Daniel Kwasi. "Cyclopiazonic acid changes the mode of excitation-contraction couplingin acetylcholine-stimulated bovine tracheal smooth muscle". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B3121387X.
Texto completo da fonteStrube, Caroline. "Mouvements de charges intramembranaires et couplage excitation-contraction du muscle squelettique de mammifere au cours du developpement prenatal". Paris 11, 1993. http://www.theses.fr/1993PA112223.
Texto completo da fonteSobocinski, Przemyslaw. "Dynamique de la fragmentation de la molécule H2 consécutive à une capture électronique dans les collisions O5+ et Xe23+ + H2 à basse et très basse énergie". Caen, 2003. http://www.theses.fr/2003CAEN2039.
Texto completo da fonteMohammed, Abdullahi. "Optical and structural characterisation of low dimensional structures using electron beam excitation systems". Thesis, University of Strathclyde, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367049.
Texto completo da fonteReynolds, Charlene Helen. "Changes in the balance of excitation and inhibition in the human motor cortex with voluntary movements". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0024/MQ40813.pdf.
Texto completo da fonteSilva, Arlindo Moraes da. "The role of temporal changes of the zonal wind on the excitation of large scale transients". Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/58019.
Texto completo da fonteIncludes bibliographical references (p. 227-239).
by Arlindo Moraes da Silva, Jr.
Ph.D.
Amoako, Daniel Kwasi. "Cyclopiazonic acid changes the mode of excitation-contraction coupling in acetylcholine-stimulated bovine tracheal smooth muscle /". Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1865017X.
Texto completo da fonteChoi, Taeyoung. "STM studies of charge transfer and transport through metal-molecule complexes on ultrathin insulating films". The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1299525515.
Texto completo da fonteNeupane, Bhanu. "Excited state electronic structure, excitation energy transfer, and charge separation dynamics in various natural and artificial photosynthetic systems containing zinc and magnesium chlorins". Diss., Kansas State University, 2011. http://hdl.handle.net/2097/13105.
Texto completo da fonteDepartment of Chemistry
Ryszard J. Jankowiak
This dissertation reports the low temperature frequency domain spectroscopic study of three different natural pigment protein complexes and one artificial antenna system. The main focus of this work is to better understand electronic structure, excitation energy transfer (EET), and electron transfer (ET) dynamics in these systems that could have impact on achieving higher efficiency in future artificial solar cells. In the first part of this dissertation, electronic structure and EET pathways in isolated intact CP43 prime protein complex, which is isolated from Cyanobacterium synechocystis PCC 6803 grown under iron stressed conditions, are investigated using low-temperature absorption, fluorescence, fluorescence excitation, and hole-burning (HB) spectroscopies. This work suggests that, in analogy to the CP43 complex of PSII core, CP43 prime possesses two quasi-degenerate low energy states, A prime and B prime. The various low-temperature optical spectra are fitted considering an uncorrelated EET model. This work suggests that for optimal energy transfer from CP43 prime to PSI, the A prime and B prime state chlorophylls belonging to each CP43 prime should face towards the PSI core. The second part of dissertation reports the photochemical HB study on novel Zinc bacterial reaction center (Zn-RC) from Rhodobacter sphaeroides and its β-mutant (Zn-β-RC). This study shows that ET in the two samples is similar; however, the quantum efficiency of charge separation in the mutant decreases by 60 %. This finding suggests that the coordination state of the HA site zinc bacteriochlorophyll does not tune the active branch ET. Simultaneous fits of various optical spectra using experimentally determined inhomogeneity provides more reliable electron phonon coupling parameters for the P870 state of both RC samples. In the last part of this dissertation, EET in a novel artificial antenna system (ethynyl linked chlorophyll trefoil, ChlT1) is investigated. EET time in ChlT1 is ~2 ps. ChlT1 in MTHF/ethanol glass forms four different types of aggregates, A1-A4. The EET time in A1 and A2 type aggregates slows down only by a factor of 5 and 7, respectively. This study suggests that ChlT1 and its aggregates can be used as efficient antenna systems in designing organic solar cells.
Kloth, Philipp [Verfasser], Wenderoth [Akademischer Betreuer] [Gutachter], Mathias [Gutachter] e Repp [Gutachter]. "Optical Excitation in Scanning Tunneling Microscopy: From Surface Photovoltages to Charge Dynamics oin the Atomic Scale / Philipp Kloth ; Gutachter: Wenderoth, Mathias, Repp ; Betreuer: Wenderoth". Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://d-nb.info/1131354907/34.
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