Measurement of the methane isotopologues relaxation rate exploiting quartz-enhanced photoacoustic spectroscopy

Giglio, Marilena; Olivieri, Mariagrazia; Sukhinets, Anton; Gioia, Michele Di; Elefante, Arianna; Menduni, Giansergio; Zifarelli, Andrea; Patimisco, Pietro; Sampaolo, Angelo; Spagnolo, Vincenzo

doi:10.1117/12.2608851

Cited by 1 publication

(2 citation statements)

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“…Due to the high purity of the gas samples, the controlled laboratory environment and the evacuable gas flow system it is not expected that water vapor or other impurities play a major role in the relaxation process. Since there are no significant differences between the relaxation times of the two methane isotopologues, the 13 CH 4 / 12 CH 4 ratio should also not have a substantial influence on the photoacoustic signal (Giglio et al, 2022). As no efficient vibro-vibrational (V-V) transition between the ν 3 state of CH 4 (CH 4 *) and N 2 exists, only three non-radiative relaxation channels are possible (Schilt et al, 2006):…”

Section: Measurement Proceduresmentioning

confidence: 99%

“…An alternative to IRMS could be photoacoustic spectroscopy (PAS) (Palzer, 2020). PAS is mainly suitable for the detection of trace gases but has been shown to enable the identification and quantification of methane isotopologues in the single-digit per mill range (Giglio et al, 2022) down to the parts per million (ppm) range (Loh and Wolff, 2019). The latter corresponds to typical concentrations in the atmosphere (van Amstel, 2012).…”

Section: Introductionmentioning

confidence: 99%

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PAS-based isotopologic analysis of highly concentrated methane

Bahr

Wolff

2022

Front. Environ. Chem.

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Photoacoustic spectroscopy (PAS) is typically used for the detection of trace gases. In this way, mixtures of short-chain hydrocarbons such as methane, ethane or propane can be analyzed with detection limits in the range of parts per million (ppm) or parts per billion (ppb) or even below. However, there are a number of applications where highly concentrated mixtures need to be analyzed. In some cases even the isotopologic composition of certain hydrocarbons needs to be determined. Examples can be found in natural gas production and planetary research. We present PAS-based isotopologic analyses of two digit percentage-level methane concentrations in nitrogen. The investigation allows conclusions to be drawn about the extent to which PAS is suitable for an isotopologic analysis of undiluted natural gas-like mixtures.

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Section: Measurement Proceduresmentioning

confidence: 99%