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

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http://hdl.handle.net/10138/312056

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Karhu , J , Tomberg , T , Senna Vieira , F , Genoud , G , Hänninen , V , Vainio , M , Metsälä , M , Hieta , T , Bell , S & Halonen , L 2019 , ' Broadband photoacoustic spectroscopy of 14CH4 with a high-power mid-infrared optical frequency comb ' , Optics Letters , vol. 44 , no. 5 , pp. 1142-1145 . https://doi.org/10.1364/OL.44.001142

Title: Broadband photoacoustic spectroscopy of 14CH4 with a high-power mid-infrared optical frequency comb
Author: Karhu, Juho; Tomberg, Teemu; Senna Vieira, Francisco; Genoud, Guillaume; Hänninen, Vesa; Vainio, Markku; Metsälä, Markus; Hieta, Tuomas; Bell, Steven; Halonen, Lauri
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2019-03-01
Language: eng
Number of pages: 4
Belongs to series: Optics Letters
ISSN: 0146-9592
URI: http://hdl.handle.net/10138/312056
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. 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.
Subject: RADIOCARBON DIOXIDE
C-14
116 Chemical sciences
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