Radiocarbon dioxide detection using cantilever-enhanced photoacoustic spectroscopy

Mehr Fatima; Thomas Hausmaninger; Teemu Tomberg; Juho Karhu; Markku Vainio; Tuomas Hieta; Guillaume Genoud

doi:10.1364/OL.420199

Radiocarbon dioxide detection using cantilever-enhanced photoacoustic spectroscopy

Mehr Fatima, Thomas Hausmaninger, Teemu Tomberg, Juho Karhu, Markku Vainio, Tuomas Hieta, Guillaume Genoud^* (Corresponding Author)

^*Corresponding author for this work

BA6605 Optical spectroscopy

Research output: Contribution to journal › Article › Scientific › peer-review

11 Citations (Scopus)

Abstract

In this Letter, we report on the sub-parts-per-billion-level radiocarbon dioxide detection using cantilever-enhanced photoacoustic spectroscopy. The ¹⁴C/C ratio of samples is measured by targeting a ¹⁴CO₂ absorption line with minimal interference from other CO₂ isotopes. Using a quantum cascade laser as a light source allows for a compact experimental setup. In addition, measurements of sample gases with ¹⁴CO₂ concentrations as low as 100 parts-per-trillion (ppt) are presented. The Allan deviation demonstrates a noise equivalent concentration of 30 ppt at an averaging time of 9 min. The achieved sensitivity validates this method as a suitable alternative to more complex optical detection methods for radiocarbon dioxide detection used so far, and it can be envisioned for future in situ radiocarbon detection.

Original language	English
Pages (from-to)	2083-2086
Number of pages	4
Journal	Optics Letters
Volume	46
Issue number	9
DOIs	https://doi.org/10.1364/OL.420199
Publication status	Published - 1 May 2021
MoE publication type	A1 Journal article-refereed

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title = "Radiocarbon dioxide detection using cantilever-enhanced photoacoustic spectroscopy",

abstract = "In this Letter, we report on the sub-parts-per-billion-level radiocarbon dioxide detection using cantilever-enhanced photoacoustic spectroscopy. The 14C/C ratio of samples is measured by targeting a 14CO2 absorption line with minimal interference from other CO2 isotopes. Using a quantum cascade laser as a light source allows for a compact experimental setup. In addition, measurements of sample gases with 14CO2 concentrations as low as 100 parts-per-trillion (ppt) are presented. The Allan deviation demonstrates a noise equivalent concentration of 30 ppt at an averaging time of 9 min. The achieved sensitivity validates this method as a suitable alternative to more complex optical detection methods for radiocarbon dioxide detection used so far, and it can be envisioned for future in situ radiocarbon detection.",

author = "Mehr Fatima and Thomas Hausmaninger and Teemu Tomberg and Juho Karhu and Markku Vainio and Tuomas Hieta and Guillaume Genoud",

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AU - Fatima, Mehr

AU - Hausmaninger, Thomas

AU - Tomberg, Teemu

AU - Karhu, Juho

AU - Vainio, Markku

AU - Hieta, Tuomas

AU - Genoud, Guillaume

PY - 2021/5/1

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N2 - In this Letter, we report on the sub-parts-per-billion-level radiocarbon dioxide detection using cantilever-enhanced photoacoustic spectroscopy. The 14C/C ratio of samples is measured by targeting a 14CO2 absorption line with minimal interference from other CO2 isotopes. Using a quantum cascade laser as a light source allows for a compact experimental setup. In addition, measurements of sample gases with 14CO2 concentrations as low as 100 parts-per-trillion (ppt) are presented. The Allan deviation demonstrates a noise equivalent concentration of 30 ppt at an averaging time of 9 min. The achieved sensitivity validates this method as a suitable alternative to more complex optical detection methods for radiocarbon dioxide detection used so far, and it can be envisioned for future in situ radiocarbon detection.

AB - In this Letter, we report on the sub-parts-per-billion-level radiocarbon dioxide detection using cantilever-enhanced photoacoustic spectroscopy. The 14C/C ratio of samples is measured by targeting a 14CO2 absorption line with minimal interference from other CO2 isotopes. Using a quantum cascade laser as a light source allows for a compact experimental setup. In addition, measurements of sample gases with 14CO2 concentrations as low as 100 parts-per-trillion (ppt) are presented. The Allan deviation demonstrates a noise equivalent concentration of 30 ppt at an averaging time of 9 min. The achieved sensitivity validates this method as a suitable alternative to more complex optical detection methods for radiocarbon dioxide detection used so far, and it can be envisioned for future in situ radiocarbon detection.

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Radiocarbon dioxide detection using cantilever-enhanced photoacoustic spectroscopy

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