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Temperature-dependent absorption cross-sections of HCFC-142b
Authors:Karine Le Bris  Kimberly Strong
Institution:a Department of Physics, Saint Francis Xavier University, P.O. Box 5000, Antigonish, NS, Canada B2G 2W5
b Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7
Abstract:Following the recent detection of HCFC-142b (1-chloro-1,1-difluoroethane) from space, laboratory infrared absorption cross-section spectra of this molecule in a pure vapour phase have been recorded in the View the MathML source spectral region using Fourier transform spectroscopy. The spectra have been recorded at a resolution of View the MathML source and a range of temperatures from 223 to 283 K. The resulting data show good agreement with the harmonic frequencies and intensities calculated using density functional theory as well as with the integrated absorption intensities of the spectral bands available in the literature. The new cross-sections will allow more accurate retrieval of atmospheric HCFC-142b concentrations using infrared spectroscopic techniques.
Keywords:Hydrochlorofluorocarbons  R-142b  Cross-sections  Mid-infrared  FTIR  Gas phase  Density functional theory  Vibrational wave number  Band strength
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