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A High-Resolution Analysis of the ν3 Absorption Band of Trifluoromethane

✍ Scribed by K.M Smith; G Duxbury; D.A Newnham; J Ballard

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
170 KB
Volume
212
Category
Article
ISSN
0022-2852

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✦ Synopsis

A high-resolution (up to 0.0018 cm -1 unapodized) room temperature mid-infrared (650 to 750 cm -1 , 13.3 to 15.4 µm) absorption measurement of the ν 3 vibrational band of trifluoromethane (fluoroform, CHF 3 , HFC-23) vapor was made with a Fourier transform spectrometer. A rovibrational analysis of over 1400 infrared transitions of the ν 3 band has yielded rotational constants, including sextic centrifugal distortion constants. The results are compared with two previous analyses of microwave and infrared spectra. The line positions of the lower J parts of the ν 3 + ν 6 -ν 6 and 2ν 3 -ν 3 hot bands have been identified and constants obtained for the 2ν 3 state. The central Q branch and a few unblended transitions of the ν 3 band of 13 CF 3 H have been identified and the band origin has been determined. The relative intensities of the ν 3 band together with the 2ν 3 -ν 3 hot band and ν 3 band of 13 CF 3 H have been calculated using the constants derived from this work.

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