Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 26: Ultracold Plasmas and Rydberg systems (joint session A/Q)
A 26.2: Vortrag
Mittwoch, 7. März 2018, 14:15–14:30, K 0.011
An optogalvanic flux sensor for trace gases — •Johannes Schmidt1,2,5, Markus Fiedler1,5, Ralf Albrecht1,5, Denis Djekic3,5, Patrick Schalberger2,5, Holger Baur2,5, Robert Löw1,5, Tilman Pfau1,5, Jens Anders3,5, Norbert Frühauf2,5, Edward Grant4, and Harald Kübler1,5 — 15th Institute of Physics — 2Institute for Large Area Microelectronics — 3Institute for Theory of Electrical Engineering — 4Department of Chemistry, University of British Columbia — 5University of Stuttgart, Center for Integrated Quantum Science and Technology (IQST)
We demonstrate the applicability of a new kind of gas sensor based on Rydberg excitations. From an arbitrary probe gas the molecule in question is excited to a Rydberg state, by succeeding collisions with all other gas components this molecule gets ionized and the emerging electron and ion can then be measured as a current, which is the clear signature of the presence of this particular molecule. As a first test we excite Alkali Rydberg atoms in an electrically contacted vapor cell [1,2] and demonstrate sensitivities down to 100 ppb on a background of N2. We investigate different amplification circuits, ranging from solid state devices on the cell to thin film technology based transimpedance amplifiers inside the cell [3]. For a real life application, we employ our gas sensing scheme to the detection of nitric oxide in a background gas at thermal temperatures and atmospheric pressure.
[1] D. Barredo, et al., Phys. Rev. Lett. 110, 123002 (2013)
[2] R. Daschner, et al., Opt. Lett. 37, 2271 (2012)
[3] J. Schmidt, et al., AMFPD 24, 296-298 (2017)