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High-Resolution Analysis of the ν4 Absorption Band of CH279BrF

✍ Scribed by A. Baldacci; P. Stoppa; A. Gambi

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
99 KB
Volume
201
Category
Article
ISSN
0022-2852

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✦ Synopsis

The gas-phase infrared spectrum of the 4 fundamental band of CH 2 79 BrF was recorded in the 1010 -1116 cm Ϫ1 wavenumber region using a TDL spectrometer. In this first high-resolution investigation of the synthesized 79 Br isotopic form, more than 10 200 transitions of this a/b-hybrid band centered at 1068.5385 cm Ϫ1 were assigned and, using the Watson's A-reduced Hamiltonian in the I r -representation, a reliable set of molecular constants for the excited state v 4 ϭ 1 was determined. From ground state combination differences having rotational quantum numbers J and K a up to 97 and 21, respectively, improved and extended ground state rotational and centrifugal distortion constants were calculated as well. Comparison between the observed and calculated band intensities in appropriate regions of the spectrum gave an estimate of the transition dipolemoment ratio along the a and b axes as ͉⌬ a /⌬ b ͉ ϭ 2.0 Ϯ 0.2, in agreement with the predicted theoretical value of 1.99.

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