Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 33: Poster Session II
A 33.37: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
Integrated and Time-Resolved Measurements of Collisional Energy Transfer in Rubidum P-States — •Ralf Albrecht1, Johannes Schmidt1,2, Robert Löw1, and Harald Kübler1 — 1Integrated Quantum Science and Technology, Universität Stuttgart, 5. Physikalisches Institut — 2Institut für Großflächige Mikroelektronik
Buffer gases are often used as collisional partners in spectroscopy gases e.g. to effectively average out the Doppler effect by redistributing velocity classes and therefore extend the time of light-matter interactions. We want to determine collisional cross-sections of excited 5P-states in rubidium. Thus, fluorescence spectra are acquired to observe quenching collisions by evaluating fluorescence intensities of different optical transitions. In addition, measurements at various atomic densities and thermal velocities are taken to extract information of the temperature dependence of collisional decay rates. Furthermore, a setup for pulsed saturation spectroscopy was built to measure time-resolved decay rates of optically excited rubidium. This allow us to measure quenching collisions with nanosecond resolution. The results are compared with that from our fluorescence measurements.