Coherence and Decoherence in High-mass Matter-wave Interferometry

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The present thesis deals with two main topics. First, I study in detail the interaction of a delocalized molecular matter-wave with a standing-wave laser grating. Due to absorption of photons in an optical grating, molecules can get excited and numerous internal photophysical processes are induced. For the theoretical description of the molecule-light interaction I take three relevant internal molecular processes into account: intersystem crossing, fluorescence and internal conversion. Furthermore, the fact that molecules can change their optical properties because of the photoexcitation is shown to have a measurable effect on matter-wave interferometry. The second topic of this thesis is about collisions between a polar molecule and non-polar environmental gas atoms, and their effects on the coherence of the center-of-mass state. Because the scattering potential depends on the molecular orientation the molecular rotational state must also be considered. Assuming a slow rotation of the molecule compared to the scattering time and that the molecular mass fairly exceeds the mass of a gas atom, I present a master equation of collisional decoherence, which depends on the molecular orientation. Its predictions for matter-wave interferometry are discussed both in the near and far field.
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Wissenschaftliche Abschlussarbeiten » Dissertation
Fakultät / Institut:
Fakultät für Physik
Dewey Dezimal-Klassifikation:
500 Naturwissenschaften und Mathematik » 530 Physik
Prof. Dr. Hornberger, Klaus [Betreuer(in), Doktorvater]
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Dissertationen / Dokument veröffentlicht
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