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Formaldehyde around 3.5 and 5.7-µm: measurement and calculation of broadening coefficients

By David Jacquemart, Anne Laraia, Fridolin Kwabia Tchana, Robert Gamache, Agnes Perrin and Nelly Lacome


International audienceSelf- and N2-broadening coefficients of H2CO have been retrieved in both the 3.5 and 5.7-μm spectral regions. These coefficients have been measured in FT spectra for transitions with various J (from 0 to 25) and K values (from 0 to 10), showing a clear dependence with both rotational quantum numbers J and K. First, an empirical model is presented to reproduce the rotational dependence of the measured self- and N2-broadening coefficients. Then, calculations of N2-broadening of H2CO were made for some for 3296 2 transitions using the semi-classical Robert-Bonamy formalism. These calculations have been done for various temperatures in order to obtain the temperature dependence of the line widths. Finally, self- and N2-broadening coefficients, as well as temperature dependence of the N2-widths has been generated to complete the whole HITRAN 2008 version of formaldehyde (available as supplementary materials)

Topics: Formaldehyde, broadening coefficients, widths, H2CO, Fourier transform spectroscopy, Robert Bonamy formalism, science direct, [ CHIM.THEO ] Chemical Sciences/Theoretical and/or physical chemistry
Publisher: HAL CCSD
Year: 2010
DOI identifier: 10.1016/j.jqsrt.2010.02.004
OAI identifier: oai:HAL:hal-00744701v1
Provided by: Hal-Diderot

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