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. Owing 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 is reported and given a preliminary assignment. The results lay a foundation for the development of optical detection systems for radiocarbon methane.
© 2019 Optical Society of AmericaFull Article | PDF Article
10 July 2019: A typographical correction was made to the funding section.
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