Abstract
The ν2 (νeff. 854.841 cm−1) and 2ν3 infrared bands (νeff. 840.083 cm−1) of DSiF3 have been studied with a resolution of 2.5 × 10−3 cm−1. Moreover, millimeter-wave transitions in the v2 = 1 and v3 = 2 states up to J" = 33 have been measured. The assignments and fit of the poorly resolved, compressed cluster-type 2ν3 IR transitions have been confirmed by a simultaneous study of the 2ν3–ν3 band. The constant W = 5.116 cm−1 of the Fermi interaction between the v2 = 1 and v3 = 2 levels has been determined from frequency effects which are in agreement with relative intensities of the ν2 and 2ν3 bands. The deperturbed (B0 − Bv) and (C0 − Cv) values of the states involved agree with their ab initio predictions within 7% in the worst case.
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