Relevant bibliographies by topics / Excitation ir

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  2. Dissertations / Theses
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  4. Conference papers

Academic literature on the topic 'Excitation ir'

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Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Excitation ir"

1

Brown, Robert C., and Robert E. Wyatt. "Vibrational resonances and IR multiphoton excitation." Journal of Chemical Physics 82, no. 11 (June 1985): 4777–87. http://dx.doi.org/10.1063/1.448695.

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Xiang, Bo, Raphael F. Ribeiro, Adam D. Dunkelberger, Jiaxi Wang, Yingmin Li, Blake S. Simpkins, Jeffrey C. Owrutsky, Joel Yuen-Zhou, and Wei Xiong. "Two-dimensional infrared spectroscopy of vibrational polaritons." Proceedings of the National Academy of Sciences 115, no. 19 (April 19, 2018): 4845–50. http://dx.doi.org/10.1073/pnas.1722063115.

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We report experimental 2D infrared (2D IR) spectra of coherent light–matter excitations––molecular vibrational polaritons. The application of advanced 2D IR spectroscopy to vibrational polaritons challenges and advances our understanding in both fields. First, the 2D IR spectra of polaritons differ drastically from free uncoupled excitations and a new interpretation is needed. Second, 2D IR uniquely resolves excitation of hybrid light–matter polaritons and unexpected dark states in a state-selective manner, revealing otherwise hidden interactions between them. Moreover, 2D IR signals highlight the impact of molecular anharmonicities which are applicable to virtually all molecular systems. A quantum-mechanical model is developed which incorporates both nuclear and electrical anharmonicities and provides the basis for interpreting this class of 2D IR spectra. This work lays the foundation for investigating phenomena of nonlinear photonics and chemistry of molecular vibrational polaritons which cannot be probed with traditional linear spectroscopy.
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Wokosin, D., V. F. Centonze, and J. G. White. "UV-excited fluorophore images obtained with IR excitation." Proceedings, annual meeting, Electron Microscopy Society of America 54 (August 11, 1996): 906–7. http://dx.doi.org/10.1017/s0424820100166993.

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The widespread use of two-photon excitation fluorescence imaging has been somewhat inhibited by the necessity to use large, expensive, high-power, short-pulse lasers. These ultra-short pulse lasers are used as an excitation source in a raster scanning configuration to provide sufficient peak power density in a lens focal volume to generate detectable two-photon absorption events for rapid imaging. Biological studies often benefit from multiple fluorescent labels and multi-labelled samples often require different excitation wavelengths for adequate excitation of the various colored fluorophores. This is achieved inexpensively with the three Krypton Argon laser lines in standard confocal imaging systems, but multiple two-photon excitation lasers--if available-- would be a very expensive system. The lasers commonly used for two-photon imaging are tuneable, but this is not a non-trivial and time consuming process. The tuning range on these lasers allows good access to the blue-emitting and green-emitting fluorophores via two-photon excitation; however, we have found that a fixed-wavelength, compact,
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Jungclas, Hartmut, Anna M. Popova, Viacheslav V. Komarov, Lothar Schmidt, and Alexander Zulauf. "Vibration Energy Accumulation and Redistribution in Organic Molecules Irradiated by Infrared Photons." Zeitschrift für Naturforschung A 62, no. 5-6 (June 1, 2007): 324–30. http://dx.doi.org/10.1515/zna-2007-5-614.

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A theoretical approach to the dissociation and low-energy electronic excitation of polyatomic organic molecules with donor and acceptor substructures is suggested. The donor hydrocarbon molecular substructures can serve as antennas for low-energy infrared (IR)-photon absorption, which coherently induce collective vibrational excitations (excimols). Due to dipole-dipole interactions, the accumulated energy can transit to the molecular acceptors: dipole-type trap-bonds or molecular parts with π-electron orbits. The analytical expressions for the probability functions of molecular fragmentation and electronic excitation induced by IR-multiphoton absorption are derived. The vibrational energy accumulation and redistribution in the molecules of diphenylalkanes irradiated by infrared photons are considered from the presented point of view.
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Jakubetz, W., T. Joseph, and J. Manz. "Selective IR-multiphoton excitation of hyperspherical modes." Chemical Physics Letters 126, no. 1 (April 1986): 48–53. http://dx.doi.org/10.1016/0009-2614(86)85114-4.

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Knippers, W., G. Luijks, S. Stolte, and J. Reuss. "IR two-photon excitation of ethylene, reconsidered." Infrared Physics 25, no. 1-2 (February 1985): 197–99. http://dx.doi.org/10.1016/0020-0891(85)90077-6.

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Kern-Michler, Daniela, Carsten Neumann, Nicole Mielke, Luuk J. G. W. van Wilderen, Matiss Reinfelds, Jan von Cosel, Fabrizio Santoro, Alexander Heckel, Irene Burghardt, and Jens Bredenbeck. "Controlling Photochemistry via Isotopomers and IR Pre-excitation." Journal of the American Chemical Society 140, no. 3 (January 12, 2018): 926–31. http://dx.doi.org/10.1021/jacs.7b08723.

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Tran, P. "Population transfer through the continuum: ir excitation ofHeH+." Physical Review A 59, no. 2 (February 1, 1999): 1444–50. http://dx.doi.org/10.1103/physreva.59.1444.

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Artjuschenko, V. G., K. I. Kalaidjian, and M. M. Mirakian. "Excitation of middle-IR range hollow metallic waveguides." International Journal of Infrared and Millimeter Waves 12, no. 10 (October 1991): 1175–85. http://dx.doi.org/10.1007/bf01008560.

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Brower, Daniel T., and Isabel K. Lloyd. "Investigation of the effect of host composition on the photoluminescent properties of SrxBa1−xS doped with Eu and Sm." Journal of Materials Research 10, no. 1 (January 1995): 211–15. http://dx.doi.org/10.1557/jmr.1995.0211.

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The effect of modifying the host composition on the photoluminescent properties of the ir stimulable phosphor system SrBaS : (Eu, Sm) was investigated. Spectral measurements (stimulated emission, fluorescent emission, excitation, and IR stimulation) were made on nine separate host compositions. The lattice constant, ionicity, and lattice strain affect Stark splitting of the rare earth excited states. While large shifts in the ir stimulated emission and fluorescence wavelengths were observed, no shift was observed for the peak excitation and ir stimulation wavelengths.
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Dissertations / Theses on the topic "Excitation ir"

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Beyvers, Stephanie. "Selective excitation of adsorbate vibrations on dissipative surfaces." Phd thesis, Universität Potsdam, 2008. http://opus.kobv.de/ubp/volltexte/2008/2551/.

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The selective infrared (IR) excitation of molecular vibrations is a powerful tool to control the photoreactivity prior to electronic excitation in the ultraviolet / visible (UV/Vis) light regime ("vibrationally mediated chemistry"). For adsorbates on surfaces it has been theoretically predicted that IR preexcitation will lead to higher UV/Vis photodesorption yields and larger cross sections for other photoreactions. In a recent experiment, IR-mediated desorption of molecular hydrogen from a Si(111) surface on which atomic hydrogen and deuterium were co-adsorbed was achieved, following a vibrational mechanism as indicated by the isotope-selectivity. In the present work, selective vibrational IR excitation of adsorbate molecules, treated as multi-dimensional oscillators on dissipative surfaces, has been simulated within the framework of open-system density matrix theory. Not only potential-mediated, inter-mode coupling poses an obstacle to selective excitation but also the coupling of the adsorbate ("system") modes to the electronic and phononic degrees of freedom of the surface ("bath") does. Vibrational relaxation thereby takes place, depending on the availabilty of energetically fitting electron-hole (e/h) pairs and/or phonons (lattice vibrations) in the surface, on time-scales ranging from milliseconds to several hundreds of femtoseconds. On metal surfaces, where the relaxation process of the adsorbate via the e/h pair mechanism dominates, vibrational lifetimes are usually shorter than on insulator or semiconductor surfaces, in the range of picoseconds, being also the timescale of the IR pulses used here. Further inhibiting factors for selectivity can be the harmonicity of a mode and weak dipole activities ("dark modes") rendering vibrational excitation with moderate field intensities difficult. In addition to simple analytical pulses, optimal control theory (OCT) has been employed here to generate a suitable electric field to populate the target state/mode maximally. The complex OCT fields were analyzed by Husimi transformation, resolving the control field in time and energy. The adsorbate/surface systems investigated were CO/Cu(100), H/Si(100) and 2H/Ru(0001). These systems proved to be suitable models to study the above mentioned effects. Further, effects of temperature, pure dephasing (elastic scattering processes), pulse duration and dimensionality (up to four degrees of freedom) were studied. It was possible to selectively excite single vibrational modes, often even state-selective. Special processes like hot-band excitation, vibrationally mediated desorption and the excitation of "dark modes" were simulated. Finally, a novel OCT algorithm in density matrix representation has been developed which allows for time-dependent target operators and thus enables to control the excitation mechanism instead of only the final state. The algorithm is based on a combination of global (iterative) and local (non-iterative) OCT schemes, such that short, globally controlled time-intervals are coupled locally in time. Its numerical performance and accuracy were tested and verified and it was successfully applied to stabilize a two-state linear-combination and to enforce a successive "ladder climbing" in a rather harmonic system, where monochromatic, analytical pulses simultaneously excited several states, leading to a population loss in the target state.
Die selektive Anregung von Molekülschwingungen mittels Infrarotlicht (IR) ist vorteilhaft, um die Wirkungsquerschnitte nachfolgender photochemischer oder photophysikalischer Prozesse zu steigern, welche durch Elektronenanregung mittels ultraviolettem (UV) bzw. sichtbarem (Vis) Licht ausgelöst werden. Für Adsorbatmoleküle auf Oberflächen wurden theoretische Vorhersagen getroffen, dass eine kombinierte (IR plus UV)-Strategie ("schwingungsvermittelte Chemie") die Ausbeute bei Photodesorption und anderen Photoreaktionen deutlich zu erhöhen vermag. Kürzlich wurde im Experiment gezeigt, dass eine rein IR-vermittelte Desorption möglich ist, welche über einen schwingungsangeregten Mechanismus erfolgt. Hierbei wurde molekularer Wasserstoff von einer Si(111)-Oberfläche desorbiert, an der atomarer Wasserstoff und atomares Deuterium gebunden waren. Eine thermische Anregung, die zum Bindungsbruch führt, konnte hierbei wegen der Isotopenselektivität ausgeschlossen werden. In der vorliegenden Arbeit wurde die selektive IR-Schwingungsanregung von Adsorbaten, die als multidimensionale Oszillatoren auf dissipativen Oberflächen behandelt wurden, mit Hilfe der Dichtematrixtheorie für offene Systeme simuliert. Nicht nur die potentialvermittelte Kopplung zwischen den einzelnen Moden ist ein Hindernis für selektive Anregung, sondern auch die Kopplung der Moden des Adsorbats ("Systems") an elektronische und phononische Freiheitsgrade des Substrats ("Bades"). Die Schwingungsrelaxation verläuft hierbei auf Zeitskalen, die von Millisekunden bis hin zu wenigen hundert Femtosekunden reichen, je nach Verfügbarkeit energetisch geeigneter Elektron-Loch-Paar-Anregungen bzw. Phononen (Gitterschwingungen) in der Oberfläche. Auf Metalloberflächen, bei denen die Schwingungrelaxation des Adsorbats zumeist von einem Elektronen-Loch-Paar-Mechanismus dominiert wird, sind die Schwingungslebensdauern normalerweise kürzer als auf Isolator- oder Halbleiteroberflächen und betragen einige Picosekunden, ebenso wie die Zeitskala der hier gewählten IR-Pulse. Weitere Faktoren, die die selektive Anregung behindern können sind die Harmonizität einer Mode und die geringe Dipolaktivität sogenannter "dunkler Moden", die eine Anregung mit moderat intensiven Feldern erschweren. Zusätzlich zu einfachen analytischen Pulsen wurden Felder mittels Optimaler Kontrolltheorie (OCT) erzeugt, um eine(n) Zielzustand/-mode maximal zu populieren. Komplexe OCT Pulse wurden mit Hilfe der Husimi-Transformation analysiert, welche das Kontrollfeld im Zeit- und Energieraum aufzulösen vermag. Die in dieser Arbeit untersuchten Adsorbat/Oberflächen-Systeme waren CO/Cu(100), H/Si(100) und 2H/Ru(0001), die sich als passende Modelle erwiesen, um oben genannte Faktoren zu untersuchen. Desweiteren wurden die Auswirkungen von Temperatur, reiner Dephasierung (elastische Streuprozesse), Dauer des IR-Pulses und Systemdimensionalit"at (Behandlung von bis zu vier Freiheitsgraden) studiert. Einzelne Schwingungsmoden konnten angeregt werden, in vielen Fällen sogar zustandsselektiv. Spezielle Prozesse wie die Anregung "heißer Banden", Desorption via alleiniger Schwingungsanregung und die Anregung "dunkler Moden" wurden simuliert. Schließlich wurde ein neuer OCT-Algorithmus in Dichtematrixdarstellung entwickelt, der es erlaubt, zeitabhängige Zieloperatoren einzuführen, um nicht nur Kontrolle über den Endzustand einer Anregung, sondern auch über den Anregungsmechanismus zu erlangen. Der Algorithmus basiert auf einer Kombination von globaler (iterativer) und lokaler (nicht-iterativer) optimaler Kontrollschemata in der Art, dass kurze, global kontrollierte Intervalle zeitlich lokal miteinander gekoppelt werden. Nach numerischen Tests wurde der Algorithmus erfolgreich angewandt, um eine Linearkombination aus zwei Zuständen zu stabilisieren, sowie um eine schrittweise "Leiteranregung" in einem harmonischen System zu forcieren, bei dem monochromatische, analytische Pulse mehrere Zustände zugleich anregen und somit einen Populationsverlust im angestrebten Zielzustand zur Folge haben.
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Gaudin, Jérôme. "Processus électroniques d'excitation et de relaxation dans les solides diélectriques excités par des impulsions IR et XUV ultracourtes." Bordeaux 1, 2005. http://www.theses.fr/2005BOR13054.

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Nous avons étudiés l'excitation d'un solide diélectrique par une impulsion laser femtoseconde (fs) intense dans le domaine visible où XUV. Ce type d'irradiation produit des électrons ex-cités avec des énergies initiales qui vont de quelques eV à quelques dizaines d'eV au dessus du bas de la bande de conduction. La relaxation de ces électrons est à l'origine de nombreux phénomènes tels que l'ablation laser, le claquage optique ou le transport des électrons " chauds " dans les matériaux à intérêt technologique (SiO2 et diamant). L'objectif de ce travail de thèse est d'étudier de façon directe et de mieux comprendre ces mécanismes de relaxation électroniques. Deux techniques expérimentales complémentaires, utilisant les impulsions XUV ultrabrèves, issues de la génération d'harmoniques d'ordres élevés, ont été mises oeuvre pour mener à bien ces études. Tout d'abord, les expériences de photoémission ont permis de mettre en lumière un nouveau mécanisme d'absorption du rayonnement par les électrons de la bande de conduction : les transitions multiphotoniques interbandes. Nos résultats montrent que ce processus est le mécanisme dominant d'échau_ement des électrons. Cette conclusion est de plus corroborée par les résultats d'un modèle théorique basé sur la résolution de l'équation de Schrödinger dépendante du temps. D'autre part, des expériences " pompe/sonde " de photoémission résolue en temps ont eu pour but de sonder la population d'électrons excités par une impulsion XUV et de suivre son évolution temporelle sur une échelle de temps fs à ps. Les temps de décroissance mesurés sont de l'ordre de quelques ps pour des électrons de 30 eV. L'interprétation des ces durées de vie longue est problématique. Nous suggérons un modèle de relaxation en deux étapes, tout d'abord purement électronique et rapide, puis d'interaction avec le réseau plus lente, pour expliquer ces résultats expérimentaux. Le second type d'expériences porte sur une spectroscopie de photoconduction sur du diamant. En utilisant les harmoniques d'ordres élevés comme source d'excitation nous avons mesuré le courant de déplacement induit qui permet d'accéder au nombre d'électrons excités en fonction de l'énergie des photons incidents. Cette information permet d'étudier l'e_cacité de l'ionisation par impact (collision inélastique électron/électron). Nos résultats peuvent s'interpréter par la structure particulière du diamant qui comporte une deuxième bande interdite 10 eV au dessus du bas de la bande de conduction. Des simulations Monte-Carlo permettent de confirmer cette interprétation.
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Aroui, Hassen. "Transferts rotationnels induits par collisions dans les systèmes NH3-H2 et NH3-He." Paris 11, 1989. http://www.theses.fr/1989PA112214.

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Nous avons étudié les transferts inélastiques rotationnels induits par collisions dans l'ammoniac perturbé par H₂et He, systèmes d’intérêt astrophysique et fondamental (test du potentiel intermoléculaire). Nous avons mené cette étude par deux méthodes différentes : - Profil de raies d'absorption infrarouge - Double résonance infrarouge-infrarouge résolue dans le temps. La première nous a permis de déterminer les sections efficaces d'élargissement par pression et de couplage intradoublet (très sensible au potentiel intermoléculaire) en fonction du nombre quantique de rotation j et de la température dans la bande v₄et l'état vibrationnel fondamental. Afin de comprendre, d'une part, la différence entre les résultats obtenus en micro-onde et ceux de la bande v₄, et d'autre part pour effectuer une meilleure comparaison entre l'expérience et la théorie, nous avons mesuré des sections efficaces d'élargissement par pression dans l'état vibrationnel fondamental. Les résultats expérimentaux ainsi que les calculs théoriques semi-classiques effectués en collaboration avec G. Billing ont permis d'aboutir aux conclusions suivantes : - Différence entre la collision NH₃- He et NH₃- H₂para. -Mise en évidence d'un effet vibrationnel dans la collision NH₃- H₂ -Rôle de l'excitation rotationnelle de H₂lors de la collision. - Désaccord entre les valeurs expérimentales et théoriques du coefficient de couplage dans la collision NH₃- He. La deuxième méthode consiste à créer une perturbation de populations d'un niveau rotationnel sélectionné à l'aide d'un pulse laser (laser à C0₂TEHP), puis à détecter l'absorption transitoire avec un laser continu (diode laser). Cette étude permet de déterminer les sections efficaces collisionnelles niveau par niveau. En sondant les niveaux voisins du niveau pompé, on pourra déterminer les règles de sélection collisionnelles
We have studied rotational transfer induced by inelastic collision in NH₃perturbed by Hz and He. Their systems have astrophysical and fundamental interests. We have undertaken this study by using two methods: 1) Absorption line-profiles in the infrared. 2) Time resolved infrared-infrared double resonance. The first one allowed to determine pressure broadening (PB) cross sections and intradoublet cross relaxation (CR) cross sections caused by molecular inversion. These last ones are very sensitive to the detail of intermolecular potential. These measurements were done as a function of the rotational quantum number j and the temperature in both range of the v₄ band and of the vibrational ground state. Because of the difference between results obtained in the v₄ band and in the microwave, and in order to obtain a better comparison between measurements and calculations, we have studied the absorption line-profiles in the vibrational ground state. The main results lead to the following conclusions: - PB cross section increases with the vibrational quantum number the NH₃ - He one. - PB cross section for NH₃- H₂ para system are larger than the NH₃ - He one. - It is necessary to take the rotational excitation of H₂ into account. - Good agreement has been obtained between calculated (using a semi-classical method) and measurements for NH₃ - H₂ system. The only remaining discrepancy between theory and experience is then intradoublet CR cross section for the NH₃ - He system; we think that this could be caused by inaccuracies in the NH₃ - He potential. The second method, which is a very sensitive mean to study rotational transfer induced by inelastic collision, consist of pumping the v₂ band of NH₃ with an infrared pulse TEHP C0₂ laser in order to create a non-equilibrium population in specific rotational quantum state. This state as well as others subsequently populated by collision induced transition is monitored by diode laser tuned on the v₄ band. This study permit to determine the inelastic cross-section for every level and the collisional selection rules
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Danjoux, Raphaël. "Radiometrie photothermique sous excitation pulsee : application a des materiaux composites et a des toles d'acier emaillees." Reims, 1988. http://www.theses.fr/1988REIMS005.

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Elaboration d'un modele theorique de la radiometrie photothermique dans le cas d'une structure bicouche. Ce modele prend en compte la semitransparence et la diffusion du rayonnement incident et permet d'apprecier l'influence des parametres importants (coefficient d'absorption, resistance de contact, pertes en face avant, coefficient de diffusion, coefficient de reflexion a l'interface des deux couches). Realisation d'un logiciel de calcul. Mise aux point de deux dispositifs experimentaux
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Otto, Katharina. "Raman-Spektroskopie kleiner Moleküle und Molekülaggregate im Überschallstrahl nach thermischer Anregung." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2015. http://hdl.handle.net/11858/00-1735-0000-0022-6045-7.

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Mittels spontaner Raman-Streuung im Überschallstrahl wurden kleine Moleküle und Molekülaggregate untersucht. Es wird gezeigt wie Schwingungs- und Rotationstemperaturen im Jet mittels des Stokes/Anti-Stokes-Intensitätsverhältnisses bestimmt werden können. In Studien kleiner Wassercluster konnten Kopplungskonstanten der gebundenen OH-Oszillatoren verschiedener Ringcluster von Trimeren bis Pentameren bestimmt werden, die auch zum Verständnis der Dynamik in kondensierten Phasen relevant sind. Außerdem wird die experimentelle Ermittlung von Enthalpiedifferenzen verschiedener Monomerkonformere zweier isomerisierungsdynamisch sehr unterschiedlicher Systeme vorgestellt. Des Weiteren wurde die Weiterentwicklung der bestehenden Raman-Technik durch Kopplung mit einer IR-Laseranregung realisiert und erste Tests des neuen Aufbaus durch Studien des Methanol-Dimers durchgeführt.
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Mahiou, Rachid. "Transferts d'excitation optique et effets non lineaires dans des materiaux concentres en gadolinium." Clermont-Ferrand 2, 1987. http://www.theses.fr/1987CLF2E379.

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Fluorescence de nagdf::(4), k::(2)gdf::(5), gdcl::(3). Excitation selective dans l'ultraviolet (excitation a 1 photon) ou dans le rouge (excitation a 2 photons) d'une des composantes stark du multiplet **(6)p::(7/2) de gd**(3+). Le declin de la fluorescence entre 4,4k et la temperature ambiante permet de determiner le mode de diffusion de l'energie d'excitation. Effet de la densite d'excitation. Mise en evidence d'une fluorescence anti-stokes issue des niveaux **(6)g::(7/2), **(6)d::(3/2) et **(6)i::(7/2). Effet d'un champ magnetique
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Luthra, Antriksh. "Mid-IR Plasmonics, Cavity Coupled Excitations, and IR Spectra of Individual Airborne Particulate Matter." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu148362252748271.

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Baura, Tomáš. "Analýza fotovoltaických článků pomocí fotoluminiscence." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219874.

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This thesis deals with the analysis of solar cells by photoluminescence method. Photoluminescence method is based on the excitation of luminescence radiation of the solar cell material by an external excitation light source. This method can detect various types of defects in the material solar cells. The main objective is the design and realization of a measuring system defects of solar cells, which is based on this method. For excitation of luminescence is used LED array. For the detection of luminescence is used CCD camera with IR optical filter. To filter out the excitation light radiation is used disc screen and optical interrupter. The parameters and options of this measuring system are verified and characterized by test measuring for example the achievable rotation speed of screen and response of optical interrupter. At the end is tested detection of luminescence radiation of solar cells in the measuring system. The measured images are compared with the method of electroluminescence.
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L'Huillier, Anne. "Ionisation multiphotonique et multielectronique." Paris 6, 1986. http://www.theses.fr/1986PA066268.

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Premiere mise en evidence experimentale d'ions multicharges de gaz rares crees par absorption multiphotonique a 532 et 1064 nm, pour differentes annees de l'impulsion laser (5 a 200 ps). Etude theorique utilisant un formalisme derive de la theorie des perturbations a n corps et des techniques diagrammatiques pour l'ionisation simple et double multiphotonique d'un atome a plusieurs electrons non independants
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Rusu, Daniela Cerasela. "Etude par spectrométrie infrarouge FT-IR des excitations collectives dans les chaînes linéaires de polyparaphényles et dans leurs phases cristallines." Poitiers, 1999. http://www.theses.fr/1999POIT2297.

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Ce travail etudie, par spectrometrie infrarouge ft-ir, les excitations collectives dans les chaines lineaires de polyparaphenyles et dans leurs phases cristallines. La premiere partie est consacree a l'etude vibrationnelle des molecules de polyparaphenyles, formees de groupements atomiques identiques. Le transfert resonnant d'energie de vibration entre les motifs de base de cette chaine (radical phenylene) est etudie dans le modele de l'exciton. Cette chaine peut egalement etre assimilee a une chaine d'oscillateurs couples elastiquement, ou les pulsations propres du systeme sont fonction du nombre d'oscillateurs couples. Les proprietes de symetrie et les modes normaux de vibration du motif de base et des terminaisons de la chaine limitee (radical phenyle) sont etudies en correlation avec ceux de la molecule de benzene. Pour de courtes longueurs de la chaine, plus exactement pour les molecules de biphenyle, p - tephenyle et p - quaterphenyle, nous avons etudie les spectres infrarouges et attribue les bandes qui y apparaissent. Nous exposons quelques caracteristiques du polyparaphenylene, un polymere isolant ou semiconducteur a l'etat pur, mais bon conducteur a l'etat dope, soit avec des dopants donneurs, soit avec des dopants accepteurs. Dans la deuxieme partie de ce travail, nous nous sommes interesses aux interactions ayant lieu entre ces molecules lorsqu'elles sont engagees dans un cristal moleculaire, plus precisement aux transitions de phase.
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Book chapters on the topic "Excitation ir"

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Groß, H., Y. He, M. Quack, and G. Seyfang. "Vibrational IR-Multiphoton Excitation of Small Sulfoxides: Time-Resolved IR-Spectroscopic Detection of Dissociation Products." In Springer Proceedings in Physics, 169–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85060-8_40.

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Ackerhalt, Jay R., and Peter W. Milonni. "IR Laser Excitation in Molecules: Chaos and Diffusive Energy Growth." In Atomic and Molecular Processes with Short Intense Laser Pulses, 407–16. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0967-3_49.

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Puretzky, A. A., and V. V. Tyakht. "Inverse Electronic Relaxation Under IR Multiple-Photon Excitation of Molecules." In Laser Spectroscopy of Highly Vibrationally Excited Molecules, 329–78. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003208921-6.

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Alimpiev, S. S., N. V. Karlov, E. M. Khokhlov, S. M. Nikiforov, A. M. Prokhorov, B. G. Sartakov, and A. L. Shtarkov. "Excitation Spectrum of SF6 Irradiated by an Intense IR Laser Field." In Topics in Current Physics, 149–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82292-6_5.

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Bandrauk, André D., and Lorraine Claveau. "Rotational Coherences in the IR Excitation of Molecular Rotations at High Intensities." In Atomic and Molecular Processes with Short Intense Laser Pulses, 417–30. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0967-3_50.

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Quack, M., J. Stohner, and E. Sutcliffe. "Time-Dependent Quantum Dynamics of the Picosecond Vibrational IR-Excitation of Polyatomic Molecules." In Springer Proceedings in Physics, 284–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-47541-2_57.

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Quack, Martin. "Mode Selective Vibrational Redistribution and Unimolecular Reactions During and After Ir—Laser Excitation." In The Jerusalem Symposia on Quantum Chemistry and Biochemistry, 47–65. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-2642-7_4.

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Rini, Matteo, Jiro Itatani, Yasuhide Tomioka, Yoshinori Tokura, Robert W. Schoenlein, and Andrea Cavalleri. "Insulator-to-Metal Transition Induced by Mid-IR Vibrational Excitation in a Magnetoresistive Manganite." In Ultrafast Phenomena XV, 588–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68781-8_189.

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Zubarev, Roman A., Einar K. Fridriksson, David M. Horn, Neil L. Kelleher, Nathan A. Kruger, Mark A. Lewis, Barry K. Carpenter, and Fred W. Mclafferty. "Electron Capture Dissociation Produces Many More Protein Backbone Cleavages Than Collisional and IR Excitation." In Mass Spectrometry in Biology & Medicine, 111–20. Totowa, NJ: Humana Press, 2000. http://dx.doi.org/10.1007/978-1-59259-719-2_7.

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Kaiser, Joachim, and Alois Seilmeier. "Spectral Dynamics of The Intersubband Absorption in Quantum Well Structures After Ultrafast IR Excitation." In Intersubband Transitions in Quantum Wells: Physics and Devices, 147–52. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5759-3_22.

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Conference papers on the topic "Excitation ir"

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Plunkett, Alexander, Nathan Harkema, Robert R. Lucchese, C. William McCurdy, and Arvinder Sandhu. "Studying Multielectron Excitation and Fragmentation with Ultrafast XUV-IR Spectroscopy." In Nonlinear Optics. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/nlo.2019.ntu1b.4.

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Ashikhmin, Michael V., Axel Mellinger, and C. B. Moore. "Photodissociation of singlet ketene by two-step IR+UV excitation." In Optoelectronics and High-Power Lasers & Applications, edited by John W. Hepburn, Robert E. Continetti, and Mark A. Johnson. SPIE, 1998. http://dx.doi.org/10.1117/12.308388.

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Ueda, Hiroshi, Takahiro M. Doi, Sho Fujibayashi, Shoichiro Tsutsui, Takumi Iritani, and Hideo Suganuma. "Stringy excitation and role of IR/UV gluons in lattice QCD." In The 30th International Symposium on Lattice Field Theory. Trieste, Italy: Sissa Medialab, 2012. http://dx.doi.org/10.22323/1.164.0211.

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Arnold, Walter, Alexander A. Karabutov, Alexander P. Kubyshkin, and Vladislav Y. Panchenko. "Remote control by laser excitation and IR detector of surface acoustic waves." In Lasers, Optics, and Vision for Productivity in Manufacturing I, edited by Georges Sayegh and Michael R. Osborne. SPIE, 1996. http://dx.doi.org/10.1117/12.251183.

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Ueda, Hiroshi, Takahiro M. Doi, Sho Fujibayashi, Shoichiro Tsutsui, Takumi Iritani, and Hideo Suganuma. "Lattice QCD study for stringy excitation and role of IR/UV gluons." In Xth Quark Confinement and the Hadron Spectrum. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.171.0046.

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Zhang, Liangliang, Kaijun Mu, Ji Zhao, Tong Wu, Hai Wang, and Cunlin Zhang. "Strong THz to IR thermal radiation from random metallic nanostructures by femtosecond laser excitation." In International Conference on Optical Instruments and Technology 2015, edited by Cunlin Zhang and Xi-Cheng Zhang. SPIE, 2015. http://dx.doi.org/10.1117/12.2192952.

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Peppers, J. M., V. V. Fedorov, and S. B. Mirov. "Mid-IR Lasing and Excitation of Cr2+ ions in II-VI Semiconductors via ionization transitions." In Advanced Solid State Lasers. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/assl.2014.am5a.5.

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Anous, Noha, and Diaa Khalil. "DNG versus SNG-based IR SPR optical CO2 sensor performance evaluation under Gaussian beam excitation." In 2014 31st National Radio Science Conference (NRSC). IEEE, 2014. http://dx.doi.org/10.1109/nrsc.2014.6835092.

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De la Rosa-Cruz, Elder, Luis A. Diaz-Torres, Pedro Salas, and Ruben A. Rodriguez. "Visible emission of rare-earth-doped ZrO 2 nanocrystalline phosphor under UV and IR excitation." In Optical Science and Technology, SPIE's 48th Annual Meeting, edited by Ian T. Ferguson, Nadarajah Narendran, Steven P. DenBaars, and John C. Carrano. SPIE, 2004. http://dx.doi.org/10.1117/12.506658.

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Peppers, J., T. Konak, D. V. Martyshkin, V. V. Fedorov, and S. B. Mirov. "Spectroscopy and mid-IR lasing of Cr2+ions in ZnSe/ZnS crystals under visible excitation." In SPIE LASE, edited by W. Andrew Clarkson and Ramesh K. Shori. SPIE, 2014. http://dx.doi.org/10.1117/12.2040798.

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You might also be interested in the extended bibliographies on the topic 'Excitation ir' for particular source types:
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