Abstract
Abstract Much earlier work on the analysis of the fundamental infrared bands v11 and v8 of 1,1-difluo-roethylene has been resumed and extended. The Q-branch of the C-type band v11 ~ 802 cm-2 has been analysed, and sextic distortion constants have been obtained for v8 = 1 at ~ 1301 cm-1 . The rotational constants of the two states are found to differ noticeably (20-100 standard deviations) from values reported earlier. The discrepancies are believed to result in part from the availability of purely rotational data on v n and v 8 in the present study, but to originate primarily from the adoption of rather poor values of the ground state constants of 1,1-difluoroethylene in the earlier work on these two fundamentals.
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