A1.4 - Optimizing OF-CEAS for the Detection of stable methane isotopes in the atmosphere
- Event
- SMSI 2025
2025-05-06 - 2025-05-08
Nürnberg - Band
- Lectures
- Chapter
- A1 - Atmospheric Measurement
- Author(s)
- C. Dinc, P. Nitzsche, J. Goldschmidt - University of Freiburg, Freiburg (Germany), K. Schmitt, J. Wöllenstein - Fraunhofer IPM, Freiburg (Germany)
- Pages
- 31 - 32
- DOI
- 10.5162/SMSI2025/A1.4
- ISBN
- 978-3-910600-06-5
- Price
- free
Abstract
This work presents an approach to detect and measure the specific isotopic ratio of the stable methane isotopes 12CH4 and 13CH4 using a high-finesse cavity within an Optical Feedback CEAS system. The development of this approach is ongoing with the aim of precisely measuring the isotopic ratio under atmospheric conditions in the mid-infrared (MIR) spectral region around 3001.2 cm-1, where the absorp-tion lines of the two stable isotopologues are located and well separated under a pressure of 40 mbar enabling the simultaneous measurement of both within a spectral range of 1 cm-1.