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New and improved infrared absorption cross sections for chlorodifluoromethane (HCFC-22)
journal contribution
posted on 2016-11-09, 12:25 authored by Jeremy J. HarrisonThe 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.
Funding
The author wishes to thank the National Centre for Earth Observation (NCEO), funded by the UK Natural Environment Research Council (NERC), for supporting this work and for access to the Molecular Spectroscopy Facility (MSF) at the Rutherford Appleton Laboratory (RAL),
History
Citation
Atmospheric Measurement Techniques, 2016, 9 (6), pp. 2593-2601Author affiliation
/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and AstronomyVersion
- VoR (Version of Record)
Published in
Atmospheric Measurement TechniquesPublisher
European Geosciences Union (EGU), Copernicus Publicationsissn
1867-1381eissn
1867-8548Acceptance date
2016-05-06Copyright date
2016Available date
2016-11-09Publisher DOI
Publisher version
http://www.atmos-meas-tech.net/9/2593/2016/Notes
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.Language
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