Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 11: Ultra-cold plasmas and Rydberg systems
A 11.3: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik
Background gas induced line broadening in a rubidium vapor — •Fabian Munkes1,4, Johannes Schmidt1,2,4, Patrick Kaspar1,4, Denis Djekic3,4, Patrick Schalberger2,4, Holger Baur2,4, Robert Löw1,4, Tilman Pfau1,4, Jens Anders3,4, Norbert Frühauf2,4, and Harald Kübler1,4 — 15th Institute of Physics — 2Institute of Large Area Microelectronics — 3Institute of Smart Sensors — 4University of Stuttgart, Center for Integrated Quantum Science and Technology (IQST)
We investigate elastic and inelastic collisions of rubidium in a background gas of either nitrogen or argon. Rubidium is excited to different Rydberg S-states in an electrically contacted vapor cell [1,2]. This system implements a model for our future trace-gas sensor. The line broadening in various states is analyzed showing different behavior depending on the principal quantum number. While inelastic n- and l-changing collisions dominate for nitrogen, in contrary for argon elastic collisions prevail. A current signal in the nano-Ampere regime is generated by collisional ionization of the excited atoms for detection. For a more thorough understanding, the collisional ionization cross sections are calculated. The gained knowledge is employed to develope a trace-gas sensor based on Rydberg excitations in a thermal gas of nitric oxide [3], which is an important trace gas in medical and environmental applications.
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