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Diode laser jet spectra and analysis of the ν14 fundamental of 1,1,1,2-tetrafluoroethane (HFC-134a)

✍ Scribed by Marcel Snels; Giuseppe D’Amico

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
153 KB
Volume
221
Category
Article
ISSN
0022-2852

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✦ Synopsis

High resolution infrared spectra have been measured for mixtures of 1,1,1,2-tetrafluoroethane in Ne, expanded in a supersonic planar jet. The m 14 fundamental is an essentially unperturbed C-type band, exhibiting many DK c ¼ AE2 transitions. Accurate excited state rotational and distortion constants have been determined from an analysis of about 1250 transitions, by using WatsonÕs Hamiltonian in the S-reduction. A local perturbation has been observed with a crossing at K 0 a ¼ 11 for J 0 values between 17 and 18, and could be accounted for by a x-Coriolis interaction with a perturbing vibrational level of A 0 symmetry at about 1205.53(1) cm À1 . Due to the very efficient cooling in the jet, the rotational temperature resulted to be about 20 K, and no evidence of hot-band absorption was found.

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