Published March 31, 2020
| Version v1
Journal article
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An optogalvanic gas sensor based on Rydberg excitations
Creators
- 1. 5. Physikalisches Institut and Center for Integrated Quantum Science and Technology (IQST), Universität Stuttgart
- 2. Institut für Großflächige Mikroelektronik and IQST, Universität Stuttgart
Description
We investigate the properties of a trace-gas sensing scheme based on Rydberg excitations at the example of an idealized model system. Rydberg states in thermal rubidium (Rb) are created using a 2-photon cw excitation. These Rydberg-excited atoms ionize via collisions with a background gas of nitrogen (N2). The emerging charges are then measured as an electric current, which is on the order of several picoampere. Due to the 2-photon excitation, this sensing method has a large intrinsic selectivity combined with a promising sensitivity of 10 ppb at an absolute concentration of 1 ppm. The determination of detection limit is limited by the optical reference measurement but is at least 500 ppb.
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2020-03-31_Schmidt_etal_2020_JPhysB.pdf
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