Broadband photoacoustic spectroscopy of <sup>14</sup> CH <sub>4</sub> with a high-power mid-infrared optical frequency comb
Karhu, Juho; Tomberg, Teemu; Vieira, Francisco Senna; Genoud, Guillaume; Hänninen, Vesa; Vainio, Markku; Metsälä, Markus; Hieta, Tuomas; Bell, Steven; Halonen, Lauri (2019-03-01)
01.03.2019
Optics Letters
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202111048183
https://urn.fi/URN:NBN:fi:tuni-202111048183
Kuvaus
Peer reviewed
Tiivistelmä
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 14 CH 4 is reported and given a preliminary assignment. The results lay a foundation for the development of optical detection systems for radiocarbon methane.
Kokoelmat
- TUNICRIS-julkaisut [22892]