Relevant bibliographies by topics / Monochromators / Dissertations / Theses
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Dissertations / Theses on the topic 'Monochromators'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Kahl, Frank. "Design eines Monochromators für Elektronenquellen." [S.l.] : [s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=960411011.

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2

Tu, Yuchun. "Multilayer monochromators for EUV and X-ray optics and the interface characterization." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066062/document.

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Dans cette thèse, nous avons étudié plusieurs combinaisons de matériaux et quelques méthodes d’ingénierie des interfaces : introduction de barrières de Zr dans les multicouches Co/Mg ; pulvérisation réactive des multicouches Co/Ti ; incorporation de B et C dans les multicouches Cr/Ti and remplacement de Mo par Mo2C dans le système Mo/B4C. Les propriétés des interfaces enterrées ont pu être étudiées en combinant XRR, XPS, TEM, etc. De plus, un modèle pour analyser les empilements a été développé en se basant sur la fluorescence X induite par ondes stationnaires. Pour les multicouches à base de
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3

Thien, Joseph R. "High order parametric x-radiation from silicon and lithium fluoride crystal monochromators." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA305981.

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4

STASIULEVICIUS, ROBERTO. "Cristais naturais como monocromadores, analisadores e filtros de ordens superiores em difracao e espectrometria de neutrons." reponame:Repositório Institucional do IPEN, 1997. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10679.

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Made available in DSpace on 2014-10-09T12:42:58Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:07:48Z (GMT). No. of bitstreams: 1 04998.pdf: 12289396 bytes, checksum: b5eab2f60110a5631abee15b1a6f7817 (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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5

Herdlick, Bryan E. "Computer-controlled photodetector characterization system (design and construction)." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FHerdlick.pdf.

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6

Galez, Philippe. "Contribution à l'élaboration de monochromateurs en graphite pyrolytique." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37613765t.

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7

Galez, Philippe. "Contribution à l'élaboration de monochromateurs en graphite pyrolytique." Grenoble 1, 1988. http://www.theses.fr/1988GRE10159.

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Afin d'elaborer du graphite pyrolytique fortement oriente (mosaique 0,5 degres) par pressage a haute temperature, conception et realisation d'un four-presse qui peut atteindre des pressions de 500 bars et des temperatures de 3500**(o) c. Il est equipe d'une source radicative pour le controle in situ de la mosaique des echantillons par diffraction des rayons gamma. En introduction, description de la structure, des proprietes et des differents procedes d'elaboration du pyrographite. Discussion des raisons de son efficacite comme monochromateur. Premiere partie : conception et realisation de l'ap
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8

Dézoret, Dominique. "Monochromateur adaptatif pour rayonnement X synchrotron : étude et réalisation d'un prototype /." Gif-sur-Yvette : Direction de l'information scientifique et technique, CEA Saclay, 1996. http://catalogue.bnf.fr/ark:/12148/cb35837920v.

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9

VAN, MILLIGEN FRED JOSEPH. "IN-SITU MONITORING OF THIN FILM GROWTH USING A WIDE-BAND SCANNING MONOCHROMATOR." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188057.

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To augment the monitoring capabilities of a Balzers 760 coating chamber, we replaced the simple, single wavelength optical monitor with a wide-band scanning monochromator system which records transmission data over the visible region of the spectrum. The system is controlled by an IBM-PC. The same computer is also interfaced to a quartz crystal monitoring system which was purchased with the Balzers chamber. The scanning monochromator system required a new brighter light source to deliver sufficient signal to the detector array through the more complex, dispersive optical train. Above the chamb
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10

Rivers, Thane Damian. "Development of an automated scanning monochromator for sensitivity calibration of the MUSTANG instrument." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23866.

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11

Östlin, Andreas. "Optical components of XUV monochromator : For use in laser based angle-resolved photoemission spectroscopy." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207855.

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At the division of Material Physics at KTH an angle resolved photoemission spectrometer (ARPES) is being built. This system uses a pulsed laser to create ultraviolet light through higher harmonic generation. The laser has a high output effect which puts the optical components of the system under a large heat load. This thesis investigates the use of silicon carbide (SiC) as a possible material for use in the system. A diffraction grating is modelled and then processed by use of photolithography and plasma etching. This is then characterized by different methods, finally in its working environm
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12

Decanini, Dominique. "Conception et réalisation de miroirs monochromateurs-reflecteurs pour le rayonnement x-uv." Phd thesis, Université Pierre et Marie Curie - Paris VI, 1985. http://pastel.archives-ouvertes.fr/pastel-00713942.

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Empilements périodiques de couches minces alternées respectivement absorbantes et transparentes pour le rayonnement x-uv. Les miroirs multicouches réalises sont destines a l'astrophysique et au diagnostic des plasmas crées par laser.
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13

DELCAMP, ERIC. "Etude et optimisation de monochromateurs x-uv a haute resolution pour le rayonnement synchrotron." Paris 7, 1998. http://www.theses.fr/1998PA077034.

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Le rayonnement synchrotron est devenu en 25 ans un outil indispensable pour la recherche fondamentale. Cette source de rayonnement est polychromatique. Son utilisation de facon exploitable fait appel a un systeme optique de transfert, la ligne de lumiere, dont l'element essentiel est le monochromateur. Les techniques employees dependent de l'energie du rayonnement. Dans le domaine x-uv, s'etendant de quelques ev a 1500 ev, on utilise des reseaux en reflexion rasante en raison de la faible reflectivite des materiaux a ces energies. Les performances des monochromateurs sont caracterisees par la
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14

Benbalagh, Rabah. "Monochromateurs multicouches à bande passante étroite et à faibre fond continu pour le rayonnement X-UV." Paris 6, 2003. http://www.theses.fr/2003PA066365.

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15

Serkez, Svitozar [Verfasser], and Henry [Akademischer Betreuer] Chapman. "Design and optimization of the Grating Monochromator for Soft X-Ray Self-Seeding FELs / Svitozar Serkez. Betreuer: Henry Chapman." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2015. http://d-nb.info/1079002227/34.

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16

Eckstein, Martin [Verfasser]. "Investigation of Ultrafast Electronic and Nuclear Dynamics in Molecular Nitrogen using an XUV Time Delay Compensating Monochromator / Martin Eckstein." Berlin : Freie Universität Berlin, 2015. http://d-nb.info/1078505349/34.

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17

Keawprasert, Thada [Verfasser], and Stephan [Akademischer Betreuer] Völker. "Monochromator-based absolute calibration of radiation thermometers for thermodynamic temperature measurements of high-temperature fixed-points / Thada Keawprasert. Betreuer: Stephan Völker." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2011. http://d-nb.info/1014971705/34.

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18

Uzgel, Evren. "Design, Assembly And Calibration Of An Experimental Setup For Various Optical Measurements." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1080332/index.pdf.

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The experimental setup which consisted of the Jarrell-Ash Ebert type scanning monochromator, the Hamamatsu Si PIN Photodiode, a PC connected ADC card and a Tungstenstriplamp operated at different temperatures was assembled. The different parts needing calibration were calibrated with spectral response calibration techniques suitable for our purposes and connected to the experimental setup in a proper way. Spectral response calibrations and transmission measurements in the range 450-800 nm were carried out.
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19

OUAHABI, MUSTAPHA. "Reseaux lamellaires graves dans des structures multicouches : caracterisation et application a la realisation des monochromateurs a bande passante etroite." Paris 6, 1994. http://www.theses.fr/1994PA066216.

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Ce travail concerne l'etude de la diffraction des rayons x mous par des reseaux lamellaires graves dans des structures multicouches. Ces systemes sont realises en combinant les techniques de depots de couches d'epaisseur nanometrique a celle de la microlithographie. Les figures de diffraction et les efficacites de ces reseaux ont ete mesures a plusieurs energies du rayonnement x (930 et 275 ev). Toutes les mesures ont ete obtenues en utilisant un reflectometre realise dans notre laboratoire equipe d'un tube a rayons x, d'un goniometre 0-20 et d'un monochromateur a double cristaux. Les resultat
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20

Reimers, Petra. "Studies of Light Emission from N-B doped 6H-SiC." Thesis, Linköping University, Semiconductor Materials, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-59739.

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<p>The purpose of this thesis work was to find a way to measure basic light emission properties of nitrogen-and-boron-doped 6H-SiC, which are fabricated with a growth method developed at Linköping University. The research is in its initial phase and the light properties as well as optical measurement techniques are important. The aim is that the results of the measurements will provide feedback to the growth process what quality and doping levels that are required to get the maximum amount of light. The measurements were performed at the Laboratory of Lighting Technology, Technical University
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21

Lipr, Tomáš. "Měření kvantové účinnosti optoelektronických prvků a návrh laboratorního měřícího systému." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219353.

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This thesis deals with the issue of quantum efficiency measurement of optoelectronic devices. The physical nature of silicon solar cells is explained here. In addition, the quantum efficiency as a concept is introduced. There is also discussed the influence of a solar cell semiconductor structure on the quantum efficiency itself. Furthermore, the thesis is focused on the design of an experimental set-up for automated measurement and data acquisition. The final realization of the step motor control unit is described in detail. It includes local and/or remote operations, design and development m
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22

Pügner, Tino. "Entwicklung eines hybrid-integrierten Gitterspektrometers basierend auf einem mikro-opto-elektro-mechanischen Bauelement." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-197435.

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The subject of this thesis is the development of a hybrid-integrated scanning grating spectrometer based on a micro-opto-electro-mechanical device or a micro-opto-electromechanical system, respectively. Features of spectral measurement system to be emphasized are a miniaturized construction with the volume of about a sugar cube, a corresponding low mass and low power consumption. In contrast to comparable and currently available spectroscopic instruments with compact physical dimensions, the system offers advantages in terms of enhanced mobility, portability, energy efficency, feasibility for
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23

Coppini, Gabriele. "Applicazioni dei fasci quasi-monocromatici in medicina." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10405/.

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I raggi X, a partire dalla loro scoperta, avvenuta nel 1895 ad opera di Wilhelm Conrad Röntgen, si sono rivelati un potentissimo mezzo per lo studio della materia. In particolare in campo medico hanno permesso la nascita della diagnostica per immagini che, parallelamente allo sviluppo delle tecnologie, è diventata un mezzo imprescindibile per lo studio delle patologie. Negli ultimi decenni molti studi sono stati compiuti in particolare sui vantaggi dell’utilizzo nell’imaging di raggi X monocromatici in sostituzione dell’usuale radiazione policromatica. Con il seguente elaborato si ha l’intento
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24

Brendler, Vinzenz, Juergen Claussner, Dieter Proehl, et al. "Beamline-Instrumentierung und Experimentautomatisierung fuer ROBL an der ESRF/Grenoble (F)." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-29992.

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Durch das Forschungszentrum Rossendorf wurde in den Jahren 1996-1998 ein eigenes Strahlrohr fuer Experimente mit Synchrotronstrahlung an der ESRF (European Synchrotron Radioation Facility) in Grenoble/Frankreich aufgebaut. Das Strahlrohr verfuegt ueber zwei alternativ nutzbare Messplaetze fuer die Untersuchung von radioaktiven Proben mittels Roentgenabsorptionsspektroskopie und fuer Materialstrukturuntersuchungen mit Roentgendiffraktion. Der Bericht konzentriert sich auf die Arbeiten, die fuer die Steuerung der Optik und die Nutzung der Messplaetze hinsichtlich der Elektronik, Rechentechnik un
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25

Brendler, Vinzenz, Juergen Claussner, Dieter Proehl, et al. "Beamline-Instrumentierung und Experimentautomatisierung fuer ROBL an der ESRF/Grenoble (F)." Forschungszentrum Rossendorf, 2000. https://hzdr.qucosa.de/id/qucosa%3A21826.

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Durch das Forschungszentrum Rossendorf wurde in den Jahren 1996-1998 ein eigenes Strahlrohr fuer Experimente mit Synchrotronstrahlung an der ESRF (European Synchrotron Radioation Facility) in Grenoble/Frankreich aufgebaut. Das Strahlrohr verfuegt ueber zwei alternativ nutzbare Messplaetze fuer die Untersuchung von radioaktiven Proben mittels Roentgenabsorptionsspektroskopie und fuer Materialstrukturuntersuchungen mit Roentgendiffraktion. Der Bericht konzentriert sich auf die Arbeiten, die fuer die Steuerung der Optik und die Nutzung der Messplaetze hinsichtlich der Elektronik, Rechentechnik un
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26

Pascarelli, Sakura. "Étude EXAFS d'alliages semiconducteurs épitaxiés par détection du rayonnement X de fluorescence." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10131.

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Ce travail de these avait pour ambition l'etude des modifications de la structure atomique locale dans des alliages pseudobinaires de semiconducteurs sous contraintes epitaxiales. Compte tenu de leurs potentiels technologiques, les heterostructures ingaas/inp apparaissaient comme des systemes de choix pour cette etude qui vise a une meilleure comprehension des processus intervenant lors de la deposition epitaxiale. En effet, les processus de reorganisation atomique, lies a une minimisation d'energie interviennent dans tous composes epitaxies et presentent donc un grand interet fondamental. Sur
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27

Arbaoui, Mohammed. "Miroirs multicouches interferentiels : reflectivite de rayonnements x et x-uv, caracteristiques et applications." Paris 6, 1987. http://www.theses.fr/1987PA066101.

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Miroirs synthetiques interferentiels pouvant etre utilises comme reflecteurs de bragg. Caracterisation precise et systematique des miroirs. Monochromateur du rayonnement x-uv en vue de calibrer des elements optiques a differentes longueurs d'onde caracteristiques
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28

Sokoltsova, Tetiana. "Development of a standardless miniature XRF setup for the analysis of actinides : coupling MC methods with fundamental parameters." Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPASP018.

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La fluorescence des rayons X (XRF) est un outil analytique qualitatif et quantitatif pour la caractérisation élémentaire de nombreux types de matériaux ; elle est non destructive, rapide et convient à l'analyse d'une large gamme d'éléments. La méthode est basée sur l'excitation d'un analyte par un faisceau primaire de rayons X qui induit l'émission de la fluorescence X de l'échantillon. L'objectif de l'analyse quantitative par fluorescence X est d’établir la relation entre la concentration des éléments avec les intensités de fluorescence mesurées. Cependant, cette tâche n'est pas simple puisqu
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29

Terschlüsen, Joachim A. "Constructing and Commissioning HELIOS – A High Harmonic Generation Source for Pump-Probe Measurements with sub 50 fs Temporal Resolution : The Development of Experimental Equipment for Extreme Ultraviolet Spectroscopy." Doctoral thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-281298.

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This thesis presents HELIOS, an in-house laboratory for time-resolved pump-probe spectroscopy with extreme-ultraviolet (XUV) probe radiation. A wide span of pump wavelengths can be generated using commercial laser equipment while XUV probe radiation is generated via a high harmonic generation process in a noble gas delivering probe photons with energies between 20 eV and 72 eV. The XUV beam path features a time-preserving monochromator and was constructed and built in-house. HELIOS features an overall time resolution of about 50 fs when using 800 nm pump and 41 eV probe photons. An energy reso
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30

Kahl, Frank. "Design eines Monochromators für Elektronenquellen." Phd thesis, 2000. http://tuprints.ulb.tu-darmstadt.de/30/1/diss_kahl.pdf.

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Vor einigen Jahren wurde der erste in der Praxis funktionierende Korrektor für den Öffnungsfehler magnetostatischer Linsen gebaut. Mit seiner Hilfe kann die Auflösung moderner Mittelspannungs-Transmissionselektronenmikroskope (bis zu 200 keV Elektronenenergie) bis auf 1.2 Ångstrøm gesteigert werden. Die Auflösung hängt dann nicht mehr länger vom Öffnungsfehler sondern von der Energiebreite der Quelle ab. Für eine weitere Verbesserung der Punktauflösung bis unterhalb von einem Ångstrøm ist eine deutliche Reduzierung der Energiebreite der Quelle notwendig. In dieser Arbeit wird das Design eines
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31

Kahl, Frank [Verfasser]. "Design eines Monochromators für Elektronenquellen / von Frank Kahl." 2000. http://d-nb.info/960411011/34.

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32

Dina, Gabriel. "LAUE MONOCHROMATOR PERFORMANCE CALCULATIONS FOR A FUTURE CANADIAN LIGHT SOURCE DIFFRACTION BEAMLINE." Thesis, 2011. http://hdl.handle.net/10214/3101.

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The computational investigation of perfect and bent crystals both cylindrically and sagittaly, have led to the development of sets of optimized parameters to be used for the high energy wiggler beamline monochromator being built at the CLS. Using both Si and Ge in Bragg and Laue geometries, the developed algorithms examine parameter space for most photon flux at the crystal. Using programs in XOP, the calculation analysis for a single incident beam revealed that for symmetric flat crystals the reflection (1,1,1) in the Bragg geometry is most preferable for producing the most throughput at en
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33

羅俊民. "Multi-beam monochromator for synchrotron radiation." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/35219333349568059101.

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34

Hsin, Ming-Yeh, and 葉欣明. "Design a zone plate monochromator for hard-X-rays." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/e2v2j9.

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碩士<br>國立臺灣海洋大學<br>光電科學研究所<br>102<br>Since Rontgen find X-ray radiation, X-ray radiology technique had apply widely in material, biological, human organ and so on. Milestones like X-ray imaging, it doesn’t destroy and irrupt for object, thus direct observe inner structure of object. Because the different role of each part of the internal object depend X-ray photons irradiate, X-ray imaging by two parts, absorb contrast and phase contrast. Whether use difference absorb theory or refraction theory or not, the light property is very important for achieve good quality image. Monochromatic light is
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35

Mazurkiewicz, Paul H. "Analysis of electrophilic compounds using an electron monochromator : mass spectrometer system." Thesis, 1998. http://hdl.handle.net/1957/34080.

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36

Wang, Cheng-Shiuan, and 王政璿. "Using homemade monochromator to produce the isolated 118.2 nm picosecond vacuum ultraviolet laser." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/87848952966851174837.

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碩士<br>國立交通大學<br>應用化學系碩博士班<br>103<br>Since the beginning of the 1970s, with the development of nonlinear optics and laser system, light source for experiment can be expanded from long wavelength range to short wavelength band. Among them, vacuum ultraviolet light is a very good ionization source, and has already been used in many researches. For example, Vacuum-Ultraviolet-Ionization-detected-infrared predissociation spectroscopy (VUV-ID-IRPDS) of clusters can be used to understand intermolecular structures and interactions at the microscopic level, and the Resonance-enhanced Multiphoton Ioniza
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37

Bärtle, Jan [Verfasser]. "Theoretische und experimentelle Arbeiten zu Monochromatoren für die Elektronenmikroskopie / vorgelegt von Jan Bärtle." 2008. http://d-nb.info/990826198/34.

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38

Peng, Chao-Chi, and 彭照棋. "Feasibility studies on realization of X-ray multi-cavity of sapphire and Designing a four-crystal high resolution monochromator." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/41817951450452745801.

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碩士<br>國立交通大學<br>工學院加速器光源科技與應用碩士學位學程<br>101<br>This thesis mainly uses the theoretical simulation, given by Stetsko, to design high performance X-ray multiple cavities of silicon and sapphire. There are two ways to reach the goal : One is to combine two Fabry-Perot cavities with appropriate crystal thickness and gap, so that the cavities have high finesse[1] and high transmissivity simultaneously; the other is to Investigate the resonant behavior of three-crystal plate cavity with the ratio of crystal thickness 1:1:1 and 1:2:1 utilizing the idea from the [X.- R. Huang, Phys. Rev. Lett. 108, 224
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Μαυροειδής, Αλκιβιάδης. "Μελέτη και κατασκευή συστήματος οδήγησης μονοχρωμάτορα με σκοπό την καταγραφή φασμάτων που εκπέμπονται από ηλεκτρικές εκκενώσεις". Thesis, 2010. http://hdl.handle.net/10889/5048.

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Στα πλαίσια της παρούσας διπλωματικής εργασίας μελετήθηκε, σχεδιάστηκε και κατασκευάστηκε ένα σύστημα ελέγχου ενός φασματοσκοπίου εκπομπής υψηλής φασματικής ανάλυσης. Η συσκευή αυτή, γνωστή και ως μονοχρωμάτορας, χρησιμοποιήθηκε για την καταγραφή φασμάτων εκπομπής από μία εκκένωση αίγλης σε διάκενο ακίδα-πλάκα σε συνθήκες χαμηλής πίεσης και θερμοκρασίας. Ο μονοχρωμάτορας χρησιμοποιεί ένα διάφραγμα περίθλασης που αναλύει μια πολυχρωματική δέσμη που προσπίπτει σε αυτό, στα επιμέρους μήκη κύματος Ο έλεγχος του συνόλου των λειτουργιών του συστήματος καθώς και η καταγραφή των φασμάτων πραγματοποιεί
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40

Pügner, Tino. "Entwicklung eines hybrid-integrierten Gitterspektrometers basierend auf einem mikro-opto-elektro-mechanischen Bauelement." Doctoral thesis, 2013. https://tud.qucosa.de/id/qucosa%3A29245.

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The subject of this thesis is the development of a hybrid-integrated scanning grating spectrometer based on a micro-opto-electro-mechanical device or a micro-opto-electromechanical system, respectively. Features of spectral measurement system to be emphasized are a miniaturized construction with the volume of about a sugar cube, a corresponding low mass and low power consumption. In contrast to comparable and currently available spectroscopic instruments with compact physical dimensions, the system offers advantages in terms of enhanced mobility, portability, energy efficency, feasibility for
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41

Cometto, Vincente Franco. "Diseño, implementación y aplicación de un monocromador de cristal para rayos X optimizado con dispositivos ópticos." Bachelor's thesis, 2019. http://hdl.handle.net/11086/11695.

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Tesis (Lic. en Física)--Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, 2019.<br>El presente trabajo especial se centra en el desarrollo de un monocromador de cristal de Si el cual fue optimizado con un dispositivo óptico colocado a la salida de la fuente de rayos X. El dispositivo óptico fue construido con guías de haces (BGs) diseñadas especialmente para este trabajo. Su objetivo fue aumentar la eficiencia de monocromatización del cristal. Mediante la técnica convencional de fluorescencia de rayos X (XRF) se realizó un estudio de las subcapas L de u
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