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Dissertations / Theses on the topic 'Atom und Molekular Physik'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Liu, Ivan Chen-Hsiu. "Ultracold Rydberg Atoms in Structured and Disordered Environments." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1231945394343-32656.

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The properties of a Rydberg atom immersed in an ultracold environment were investigated. Two scenarios were considered, one of which involves the neighbouring ground-state atoms arranged in a spatially structured configuration, while the other involves them distributed randomly in space. To calculate the influence of the multiple ground-state atoms on the Rydberg atom, Fermi-pseudopotential was used, which simplified greatly the numerical effort. In many cases, the few-body interaction can be written down analytically which reveals the symmetry properties of the system. In the structured case, we report the first prediction of the formation of ``Rydberg Borromean trimers''. The few-body interactions and the dynamics of the linear A-B-A trimer, where A is the ground-state atom and B is the Rydberg atom, were investigated in the framework of normal mode analysis. This exotic ultralong-range triatomic bound state exists despite that the Rydberg-ground-state interaction is repulsive. Their lifetimes were estimated using both quantum scattering calculations and semi-classical approximations which are found to be typically sub-microseconds. In the disordered case, the Rydberg-excitation spectra of a frozen-gas were simulated, where the nuclear degrees of freedom can be ignored. The systematic change of the spectral shape with respect to the density of the gas and the excitation of the Rydberg atom were found and studied. Some parts of the spectral shape can be described by simple scaling laws with exponents given by the basic properties of the atomic species such as the polarizability and the zero-energy electron-atom scattering length.

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2

Liu, Ivan Chen-Hsiu. "Ultracold Rydberg Atoms in Structured and Disordered Environments." Doctoral thesis, Technische Universität Dresden, 2008. https://tud.qucosa.de/id/qucosa%3A23624.

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Abstract:

The properties of a Rydberg atom immersed in an ultracold environment were investigated. Two scenarios were considered, one of which involves the neighbouring ground-state atoms arranged in a spatially structured configuration, while the other involves them distributed randomly in space. To calculate the influence of the multiple ground-state atoms on the Rydberg atom, Fermi-pseudopotential was used, which simplified greatly the numerical effort. In many cases, the few-body interaction can be written down analytically which reveals the symmetry properties of the system. In the structured case, we report the first prediction of the formation of ``Rydberg Borromean trimers''. The few-body interactions and the dynamics of the linear A-B-A trimer, where A is the ground-state atom and B is the Rydberg atom, were investigated in the framework of normal mode analysis. This exotic ultralong-range triatomic bound state exists despite that the Rydberg-ground-state interaction is repulsive. Their lifetimes were estimated using both quantum scattering calculations and semi-classical approximations which are found to be typically sub-microseconds. In the disordered case, the Rydberg-excitation spectra of a frozen-gas were simulated, where the nuclear degrees of freedom can be ignored. The systematic change of the spectral shape with respect to the density of the gas and the excitation of the Rydberg atom were found and studied. Some parts of the spectral shape can be described by simple scaling laws with exponents given by the basic properties of the atomic species such as the polarizability and the zero-energy electron-atom scattering length.

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3

Antesberger, Gunter. "Phasendiffusion und Linienbreite beim Ein-Atom-Maser." Diss., lmu, 1999. http://nbn-resolving.de/urn:nbn:de:bvb:19-1275.

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4

Knufinke, Martin [Verfasser], and Reinhold [Akademischer Betreuer] Kleiner. "Aufbau und Entwicklung von Experimenten an Supraleiter-Atom-Hybridsystemen / Martin Knufinke ; Betreuer: Reinhold Kleiner." Tübingen : Universitätsbibliothek Tübingen, 2013. http://d-nb.info/1162844558/34.

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5

Pfau, Markus [Verfasser], and Ulrike [Akademischer Betreuer] Frühling. "Messaufbau für zeitauflösende Atom- und Molekülspektroskopie im extrem ultravioletten Spektralbereich / Markus Pfau ; Betreuer: Ulrike Frühling." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2020. http://d-nb.info/1208002805/34.

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6

Bayer, Tim [Verfasser]. "Resonante Starkfeld-Kontrolle kohärenter elektronischer Dynamik im K-Atom und K2-Molekül / Tim Bayer." Kassel : Kassel University Press, 2012. http://d-nb.info/1036916383/34.

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7

Janke, Christian Sören [Verfasser], Reinhard [Gutachter] Dörner, and Till [Gutachter] Jahnke. "Entwicklung und Test von drei MCP-basierten Detektoren für die Atom- und Molekülphysik / Christian Sören Janke ; Gutachter: Reinhard Dörner, Till Jahnke." Frankfurt am Main : Universitätsbibliothek Johann Christian Senckenberg, 2020. http://d-nb.info/1216194254/34.

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8

Budde, Marion. "Lernwirkungen in der Quanten-Atom-Physik : Fallstudien über Resonanzen zwischen Lernangeboten und SchülerInnen-Vorstellungen /." Berlin : Logos-Verl, 2004. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=012807704&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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9

Tolkiehn, Günter-Ulrich [Verfasser]. "Röntgenabsorptionsspektroskopie mit Synchrotronstrahlung zur Bestimmung von Elektron-Atom-Streuamplituden und Strukturparametern aus der kantenfernen Feinstruktur / Günter-Ulrich Tolkiehn." Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/1184879753/34.

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10

Schlosser, Malte [Verfasser], Gerhard [Akademischer Betreuer] Birkl, and Thomas [Akademischer Betreuer] Walther. "Bereitstellung und kohärente Kontrolle von Einzel-Atom-Quantensystemen in zweidimensionalen Quantenregistern / Malte Schlosser. Betreuer: Gerhard Birkl ; Thomas Walther." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2013. http://d-nb.info/111090181X/34.

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11

Kielich, Witoslaw [Verfasser]. "Fluoreszenzspektroskopische Untersuchung von quantenmechanischen Interferenzeffekten am Xenon-Atom und an zweiatomigen Molekülen nach monochromatischer Anregung mit Synchrotronstrahlung / Witoslaw Kielich." Kassel : Universitätsbibliothek Kassel, 2014. http://d-nb.info/1064711758/34.

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12

Roghani, Maryam [Verfasser], and Hanspeter [Akademischer Betreuer] Helm. "Vibrational cooling of a trapped atom : : its evolution to electromagnetically induced transparency, the development of the scattered radiation field and signatures of correlation and entanglement = Kühlung der Schwingungsbewegung eines gefangenen Atoms : seine Entwicklung zu elektromagnetisch induzierter Transperenz, der Zeitliche Aufbau des Feldes gestreuter Photonen und der Signaturen von Korrelation und Verschränkung." Freiburg : Universität, 2011. http://d-nb.info/1123458456/34.

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13

Wolde-Giorgis, Daniel. "Korngrenzsegregation in Silber-Nickel und Kupfer-Wismut Legierungen." Doctoral thesis, [S.l.] : [s.n.], 2005. http://webdoc.sub.gwdg.de/diss/2005/wolde-giorgis.

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14

Choi, Pyuck-Pa. "Untersuchungen zur Korngrenzensegregation in nanokristallinen Al-Cu- und Co-P-Legierungen mittels 3d-Atomsondentomographie." Doctoral thesis, [S.l.] : [s.n.], 2003. http://webdoc.sub.gwdg.de/diss/2003/choi/choi.pdf.

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15

Antesberger, Gunter [Verfasser]. "Phasendiffusion und Linienbreite beim Ein-Atom-Maser / vorgelegt von Gunter Antesberger." 1999. http://d-nb.info/959168125/34.

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16

Rinner, Stefan [Verfasser]. "Ein-Atom-Maser : Erzeugung verschränkter Zustände und Dekohärenzuntersuchungen / vorgelegt von Stefan Rinner." 2004. http://d-nb.info/971276765/34.

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17

Koch, Karsten [Verfasser]. "Lumineszenz durch hochenergetische Atom- und Clusterionen : Untersuchung an dünnen Schichten / Karsten Koch." 1999. http://d-nb.info/958837473/34.

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18

Lang, Frank Michael [Verfasser]. "Transversales Spinecho an einem atomaren Wasserstoffstrahl und spezielle Quellen für Atom- und Molekülstrahlen / vorgelegt von Frank Michael Lang." 2003. http://d-nb.info/967150213/34.

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19

Weber, Günter [Verfasser]. "Untersuchung zur Anisotropie und linearen Polarisation radiativer Prozesse in energiereichen Ion-Atom-Stößen / vorgelegt von Günter Weber." 2010. http://d-nb.info/1004109539/34.

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20

Schecker, Olivier [Verfasser]. "Von Punktkontakten zu nano-elektro-mechanischen Systemen - NEMS : Herstellung und Charakterisierung von Ein-Atom-Kontakten / Olivier Schecker." 2008. http://d-nb.info/997873442/34.

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21

Lisdat, Christian [Verfasser]. "Realisation eines Materiewelleninterferometers für Moleküle und neue Möglichkeiten zur Beobachtung von Atom-Molekül-Stößen / von Christian Lisdat." 2001. http://d-nb.info/962066877/34.

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22

Boas, Christian [Verfasser]. "Wechselwirkung von Physisorbaten an und mit Metalloberflächen : experimentelle Untersuchungen an Dünnstschichten physisorbierter Edelgase mittels Helium-Atom-Streuung / vorgelegt von Christian Boas." 2002. http://d-nb.info/965885461/34.

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23

Traeger, Franziska. "Streuexperimente mit Wasserstoff- und Heliumstrahlen zur Untersuchung der Wechselwirkung von H2, N2 und C2H2 mit den (001)-Oberflächen von LiF, NaCl, KCl und MgO." Doctoral thesis, 2001. http://hdl.handle.net/11858/00-1735-0000-000D-F212-2.

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24

Kluthe, Christian. "Wachstum und Grenzflächenbeschaffenheit oxidischer Ausscheidungen in Silber." Doctoral thesis, 2003. http://hdl.handle.net/11858/00-1735-0000-0006-B56B-C.

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25

Ene, Constantin Buzau. "Thermische Stabilität und Reaktion metallischer Multilagen." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-B464-6.

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26

Boll, Torben. "Bestimmung von Platzbesetzung und Bindungsenergien mittels Atomsondentomographie." Doctoral thesis, 2010. http://hdl.handle.net/11858/00-1735-0000-0006-B4CB-2.

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27

Rademacher, Thomas. "Untersuchung atomarer Strukturen an geordnetem und nanokristallinem ternären Fe3Al." Doctoral thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B52F-3.

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28

Gemma, Ryota. "Hydrogen in V-Fe thin films and Fe/V-Fe multi-layered thin films." Doctoral thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B53B-7.

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29

Ekinci, Yasin. "High Resolution Scattering of He Atoms and D₂ Molecules from the LiF(001) Crystal Surface." Doctoral thesis, 2003. http://hdl.handle.net/11858/00-1735-0000-0006-B47C-1.

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30

Shariq, Ahmed. "Short range ordering and microstructure property relationship in amorphous alloys." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-B44C-D.

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31

Wille, Catharina Gabriele. "Investigation of the segregation behaviour in nanocrystalline materials." Doctoral thesis, 2009. http://hdl.handle.net/11858/00-1735-0000-0006-B4AF-2.

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