Broadband photoacoustic spectroscopy of 14CH4 with a high-power mid-infrared optical frequency comb

Juho Karhu, Teemu Tomberg, Francisco Senna Vieira, Guillaume Genoud, Vesa Hänninen, Markku Vainio, Markus Metsälä, Tuomas Hieta, Steven Bell, Lauri Halonen

Research output: Contribution to journalArticleScientificpeer-review


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 14CH4 is reported and given a preliminary assignment. The results lay a foundation for the development of optical detection systems for radiocarbon methane.
Original languageEnglish
JournalOptics Letters
Issue number5
Pages (from-to)1142-1145
Number of pages4
Publication statusPublished - 1 Mar 2019
MoE publication typeA1 Journal article-refereed

Fields of Science

  • C-14
  • 116 Chemical sciences

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