SAMOP 2023 – scientific programme

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MO: Fachverband Molekülphysik

MO 15: Rotational- and Vibrational-resolution Spectroscopy

MO 15.2: Talk

Thursday, March 9, 2023, 11:30–11:45, F142

High resolution continuous wave spectroscopy on the A ²Σ⁺ ← X ²Π_3/2 transition in nitric oxide — Philipp Neufeld^1,3, Patrick Kaspar^1,3, Fabian Munkes^1,3, Alexander Trachtmann^1,3, Yannick Schellander^2,3, Robert Löw^1,3, Tilman Pfau^1,3, and •Harald Kübler^1,3 — ¹5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart — ²Institut für Großflächige Mikroelektronik, Universität Stuttgart, Allmandring 3b, 70569 Stuttgart — ³Center for Integrated Quantum Science and Technology (IQST), Universität Stuttgart

Within the scope of the development of a new kind of gas sensor [1,2], we employ Doppler-free saturated absorption spectroscopy on the A ²Σ⁺ ← X ²Π_3/2. transition in nitric oxide (NO) for different total angular momenta J on the P₁₂ branch. Spectroscopy is performed in continuous wave operation at 226 nm in a 50 cm long through-flow cell. Via phase sensitive detection by a lock-in amplifier the hyperfine structure of the X ²Π_3/2 state of NO is partially resolved. The data is compared to previous measurements, showing good agreement. Investigation of the dependence of the spectroscopic feature on power and pressure, should yield hyperfine constants, natural transition linewidth and the collisional cross-section between NO molecules. [1] P. Kaspar et. al., OSA Optical Sensors and Sensing, 19-23 July, 2021 [2] J. Schmidt et. al., Appl. Phys. Lett. 113, 01113 (2018)