Rueck, Thomas and Pangerl, Jonas and Escher, Lukas and Jobst, Simon and Mueller, Max and Bierl, Rudolf and Matysik, Frank-Michael (2024) Kinetic cooling in mid-infrared methane photoacoustic spectroscopy: A quantitative analysis via digital twin verification. PHOTOACOUSTICS, 40: 100652. ISSN 2213-5979,
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This study presents a detailed quantitative analysis of kinetic cooling in methane photoacoustic spectroscopy, leveraging the capabilities of a digital twin model. Using a quantum cascade laser tuned to 1210.01 cm(-1), we investigated the effects of varying nitrogen-oxygen matrix compositions on the photoacoustic signals of 15 ppmV methane. Notably, the photoacoustic signal amplitude decreased with increasing oxygen concentration, even falling below the background signal at oxygen levels higher than approximately 6 %V. This phenomenon was attributed to kinetic cooling, where thermal energy is extracted from the surrounding gas molecules rather than added, as validated by complex vector analysis using a previously published digital twin model. The model accurately reproduced complex signal patterns through simulations, providing insights into the underlying molecular mechanisms by quantifying individual collision contributions. These findings underscore the importance of digital twins in understanding the fundamentals of photoacoustic signal generation at the molecular level.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GAS-DETECTION; ABSORPTION; RELAXATION; AIR; CH4; Photoacoustic spectroscopy; Kinetic cooling; Quantum cascade laser; Methane; Digital twin; CoNRad; Relaxation |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Instrumentelle Analytik (Prof. Frank-Michael Matysik) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 17 Jul 2025 10:04 |
| Last Modified: | 17 Jul 2025 10:04 |
| URI: | https://pred.uni-regensburg.de/id/eprint/63555 |
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