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Dissertations / Theses on the topic 'Ultrakalten Atomen und Molekülen'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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1

Grishkevich, Sergey. "Ultracold collisions in traps." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2010. http://dx.doi.org/10.18452/16098.

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Die ultrakalte Atom- und Molekülephysik, zu welcher man zum Beispiel bei der Bose-Einstein-Kondensation von verdünnten Gasen Zugang hat, wurde untersucht. In solchen Systemen dominieren Zwei-Körper-Stöße und ihre detaillierte Untersuchung ist eines der zentralen Themen dieser Arbeit. Diese wurden durchgeführt unter Berücksichtigung von elementaren chemischen Reaktionen, Photoassoziation und magnetischen Feshbach-Resonanzen. Weiterhin wurden Untersuchungen von Atomen in optischen Gittern durchgeführt. Die Viel-Teilchen-Systeme wurden nicht nur mit dem üblichen mean-field Ansatz behandelt, sondern auch darüber hinausgehend, um die voll korrelierte Bewegung zu simulieren.
The ultracold atomic and molecular physics as it is accessible, e.g., in Bose-Einstein condensates of dilute gases was investigated. In such systems two-body collisions are dominant and their detailed study is one of the central topics of this work. They were done considering elementary chemical reactions as photoassociation, and magnetic Feshbach resonances. Additionally, studies of atoms in optical lattice sites were carried out. The many-body systems were not only considered within the usually adopted mean-field approach but also beyond that in order to simulate the fully correlated motion.
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2

Wilpers, Guido. "Ein optisches Frequenznormal mit kalten und ultrakalten Atomen." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966356330.

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3

Braun, Hendrike [Verfasser]. "Kohärente transiente und effiziente Endzustandskontrolle in Atomen und Molekülen / Hendrike Braun." Kassel : Universitätsbibliothek Kassel, 2016. http://d-nb.info/1123166374/34.

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4

Barthel, Mathias [Verfasser]. "Photoionisation von Atomen und Molekülen in definierten Zuständen / Mathias Barthel." Berlin : Freie Universität Berlin, 2009. http://d-nb.info/1023710250/34.

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5

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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6

Dvořák, Matthieu [Verfasser], and Frank [Akademischer Betreuer] Stienkemeier. "Solvation of atoms and molecules and their interactions with rare gas and hydrogen clusters = Solvatisierung von Atomen und Molekülen und deren Wechselwirkung mit Edelgas- und Wasserstoff-Clustern." Freiburg : Universität, 2011. http://d-nb.info/1123458138/34.

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7

Sohn, Sascha [Verfasser], and Heinrich Franz [Akademischer Betreuer] Arlinghaus. "Integration eines durchstimmbaren Femtosekundenlasersystems in eine Laser-Sekundärneutralteilchen-Massenspektrometrie-Apparatur zur Nachionisierung von zerstäubten Atomen und Molekülen / Sascha Sohn. Betreuer: Heinrich Franz Arlinghaus." Münster : Universitäts- und Landesbibliothek der Westfälischen Wilhelms-Universität, 2012. http://d-nb.info/1027018858/34.

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8

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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9

Finzel, Kati [Verfasser], Juri [Akademischer Betreuer] Grin, Miroslav [Akademischer Betreuer] Kohout, and Gotthard [Akademischer Betreuer] Seifert. "Über die Entwicklung der Realraumindikatoren Cp mit besonderem Hinblick auf C0.6 : sowie dessen Vergleich mit dem Lokalisierbarkeitsindikator hinsichtlich chemischer Signaturen bei Atomen, Molekülen und Festkörpern / Kati Finzel. Gutachter: Juri Grin ; Gotthard Seifert. Betreuer: Juri Grin ; Miroslav Kohout." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://d-nb.info/1067729186/34.

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10

Ernsting, Ingo [Verfasser]. "Entwicklung und Anwendung eines Frequenzkamm-basierten Lasersystems für die Präzisions-Spektroskopie an ultrakalten Molekülen und Atomen / vorgelegt von Ingo Ernsting." 2009. http://d-nb.info/1000849082/34.

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11

Kittel, Martin [Verfasser]. "Photoelektronenbeugung an adsorbierten Atomen und Molekülen / Martin Kittel." 2001. http://d-nb.info/963922637/34.

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12

Wilpers, Guido [Verfasser]. "Ein optisches Frequenznormal mit kalten und ultrakalten Atomen / von Guido Wilpers." 2002. http://d-nb.info/966356330/34.

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13

Wilhelms, Peter [Verfasser]. "Untersuchungen zur assoziativen Ionisation von Atomen und Molekülen und zu anderen Ionisationsprozessen in Stößen mit Wasserstoff-Atomen / von Peter Wilhelms." 2001. http://d-nb.info/964668580/34.

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14

Bräuning, Harald [Verfasser]. "Ladungsändernde Stöße mit Ionen und Photonen : von Atomen zu Molekülen / von Harald Bräuning." 2005. http://d-nb.info/976093804/34.

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15

Zrost, Karl [Verfasser]. "Wechselwirkung von Atomen und kleinen Molekülen mit intensiven, ultra-kurzen Laserpulsen / vorgelegt von Karl Zrost." 2005. http://d-nb.info/974318264/34.

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16

Autschbach, Jochen [Verfasser]. "Zur Berechnung relativistischer Effekte und zum Verständnis ihrer Trends bei Atomen und Molekülen / vorgelegt von Jochen Autschbach." 1999. http://d-nb.info/957596332/34.

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17

Schmidt, Klaus Jürgen [Verfasser]. "Elektronenspektroskopische Untersuchungen zur Wechselwirkung von Atomen und einfachen Molekülen mit einer Ru(10-10)-Oberfläche / von Klaus Jürgen Schmidt." 2002. http://d-nb.info/966272730/34.

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18

Borodin, Andriy [Verfasser]. "Untersuchung der Wechselwirkung von Molekülen (CsCl, NaCl, Benzolderivate) und Atomen (Na) mit gefrorenen Oberflächen (H2O, CH3OH, NH3) / vorgelegt von Andriy Borodin." 2004. http://d-nb.info/972734422/34.

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