Research output: Contribution to journal › Article › peer-review
Line parameters and shapes of high clusters : R branch of the ν3 band of CH4 in He mixtures. / Grigoriev, I. M.; Filippov, N. N.; Tonkov, M. V.; Champion, J. P.; Gabard, T.; Le Doucen, R.
In: Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 74, No. 4, 15.08.2002, p. 431-443.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Line parameters and shapes of high clusters
T2 - R branch of the ν3 band of CH4 in He mixtures
AU - Grigoriev, I. M.
AU - Filippov, N. N.
AU - Tonkov, M. V.
AU - Champion, J. P.
AU - Gabard, T.
AU - Le Doucen, R.
PY - 2002/8/15
Y1 - 2002/8/15
N2 - The IR absorption spectra of CH4 in pure gas and in mixture with helium were studied in the region of ν3 band at higher J line clusters R(17)-R(22). The frequencies and intensities of rotation-vibration lines were estimated from the experimental spectra at Doppler shape conditions. The line frequencies and intensities were calculated and used for the attribution of overlapped lines in clusters. The calculated line intensities are close to the experimental values. The calculated frequency structure of the higher J manifolds are somewhat wider than the observed one. The shapes of helium-broadened line clusters were compared with those calculated accounting for line mixing. The relaxation matrix W, which is necessary in shape calculations, was constructed using semiclassical collision rate constants. The calculated shapes are in satisfactory accordance with the measured ones.
AB - The IR absorption spectra of CH4 in pure gas and in mixture with helium were studied in the region of ν3 band at higher J line clusters R(17)-R(22). The frequencies and intensities of rotation-vibration lines were estimated from the experimental spectra at Doppler shape conditions. The line frequencies and intensities were calculated and used for the attribution of overlapped lines in clusters. The calculated line intensities are close to the experimental values. The calculated frequency structure of the higher J manifolds are somewhat wider than the observed one. The shapes of helium-broadened line clusters were compared with those calculated accounting for line mixing. The relaxation matrix W, which is necessary in shape calculations, was constructed using semiclassical collision rate constants. The calculated shapes are in satisfactory accordance with the measured ones.
KW - Line mixing
KW - Line parameters
KW - Methane
KW - Vibration-rotation spectra
UR - http://www.scopus.com/inward/record.url?scp=0037102712&partnerID=8YFLogxK
U2 - 10.1016/S0022-4073(01)00263-1
DO - 10.1016/S0022-4073(01)00263-1
M3 - Article
AN - SCOPUS:0037102712
VL - 74
SP - 431
EP - 443
JO - Journal of Quantitative Spectroscopy and Radiative Transfer
JF - Journal of Quantitative Spectroscopy and Radiative Transfer
SN - 0022-4073
IS - 4
ER -
ID: 28680711