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A: Fachverband Atomphysik
A 29: Ultra-cold plasmas and Rydberg systems III (joint session A/Q)
A 29.7: Talk
Friday, March 13, 2020, 12:45–13:00, b305
An optogalvanic flux sensor for trace gases — •Fabian Munkes1,2, Patrick Kaspar1,2, Yannick Schellander1,2, Johannes Schmidt1,2,4, Denis Djekic2,3, Patrick Schalberger2,4, Holger Baur2,4, Robert Löw1,2, Tilman Pfau1,2, Jens Anders2,3, Norbert Frühauf2,4, Edward Grant5, and Harald Kübler1,2 — 15. Physikalisches Institut — 2Center for Integrated Quantum Science and Technology — 3Institut für Intelligente Sensorik und Elektrotechnik — 4Institut für Großflächige Mikroelektronik — 5Department of Chemistry University of British Columbia
We demonstrate the applicability of a new kind of gas sensor based on Rydberg excitations. From a gas mixture the molecule in question is excited to a Rydberg state. By succeeding collisions with all other gas components this molecule becomes ionized and the emerging electron can 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 a detection limit of 100 ppb to a background of N2. For a real life application, we employ our gas sensing scheme to the detection of nitric oxide at thermal temperatures and atmospheric pressure [3]. We show first results of cw spectroscopy of the A 2Σ+ ← X 2Π1/2 transition in NO.
[1] D. Barredo, et al., Phys. Rev. Lett. 110, 123002 (2013)
[2] J. Schmidt, et al., SPIE 10674 (2018)
[3] J. Schmidt, et al., Appl. Phys. Lett. 113, 011113 (2018)