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Title: New and improved infrared absorption cross sections for chlorodifluoromethane (HCFC-22)
Authors: Harrison, Jeremy J.
First Published: 17-Jun-2016
Publisher: European Geosciences Union (EGU), Copernicus Publications
Citation: Atmospheric Measurement Techniques, 2016, 9 (6), pp. 2593-2601
Abstract: The most widely used hydrochlorofluorocarbon (HCFC) commercially since the 1930s has been chlorodifluoromethane, or HCFC-22, which has the undesirable effect of depleting stratospheric ozone. As this molecule is currently being phased out under the Montreal Protocol, monitoring its concentration profiles using infrared sounders crucially requires accurate laboratory spectroscopic data. This work describes new high-resolution infrared absorption cross sections of chlorodifluoromethane over the spectral range 730-1380 cm-1, determined from spectra recorded using a high-resolution Fourier transform spectrometer (Bruker IFS 125HR) and a 26 cm pathlength cell. Spectra of chlorodifluoromethane/dry synthetic air mixtures were recorded at resolutions between 0.01 and 0.03 cm-1 (calculated as 0.9/MOPD; MOPD denotes the maximum optical path difference) over a range of temperatures and pressures (7.5-762 Torr and 191-295 K) appropriate for atmospheric conditions. This new cross-section dataset improves upon the one currently available in the HITRAN (HIgh-resolution TRANsmission) and GEISA (Gestion et Etude des Informations Spectroscopiques Atmosphériques) databases; in particular it provides coverage over a wider range of pressures and temperatures, has more accurate wavenumber scales, more consistent integrated band intensities, improved signal to-noise, is free of channel fringing, and additionally covers the v2 and v7 bands.
DOI Link: 10.5194/amt-9-2593-2016
ISSN: 1867-1381
eISSN: 1867-8548
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: © Author(s) 2016. This work is distributed under the Creative Commons Attribution 3.0 License.
Description: The new HCFC-22 dataset is available electronically from the author and will be made available to the community via the HITRAN and GEISA databases.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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