Broadband photoacoustic spectroscopy of ${}^{14}{\text{CH}}_4$ with a high-power mid-infrared optical frequency comb

Abstract

We report a photoacoustic spectroscopy setup with a high-power mid-infrared frequency comb as the light source. The setup is used in broadband spectroscopy of radiocarbon methane. Due to the high sensitivity of a cantilever-enhanced photoacoustic cell and the high power light source, we can reach a detection limit below 100 ppb in a broadband measurement with a sample volume of only a few milliliters. The first infrared spectrum of ${}^{14}{\text{CH}}_4$ is reported and given a preliminary assignment. The results lay a foundation for the development of optical detection systems for radiocarbon methane.

corrected typos, added two references

References in corpus (1)

• Radiocarbon Dioxide detection based on Cavity Ring-Down Spectroscopy and a Quantum Cascade Laser

Cited by in corpus (9)

• Photo-acoustic dual-frequency comb spectroscopy
• Data availability and requirements relevant for the Ariel space mission and other exoplanet atmosphere applications
• Sensitive multi-species photoacoustic gas detection based on mid-infrared supercontinuum source and miniature multipass cell
• Simple method for mid-infrared optical frequency comb generation with dynamic offset frequency tuning
• Optical power detector with broad spectral coverage, high detectivity and large dynamic range
• High-resolution analysis of the ${\nu }_3$ band of radiocarbon methane ${}^{14}C{H}_4$
• Enhancement of photoacoustic spectroscopy with sorption enrichment for ppt-level benzene detection
• Versatile optical frequency combs based on multi-seeded femtosecond optical parametric generation
• Infrared spectroscopy of radioactive hydrogen chloride H${}^{36}$Cl