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The ∠ICI Bending Satellites in the Millimeter-Wave Rotational Spectra of CH2I2 and CD2I2

✍ Scribed by Z. Kisiel; E. Białkowska-Jaworska; L. Pszczółkowski

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
224 KB
Volume
199
Category
Article
ISSN
0022-2852

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✦ Synopsis

Rotational transitions in the first four excited states of the low-frequency ЄICI bending mode, 4 , have been assigned in the mm-wave rotational spectra of CH 2 I 2 and of CD 2 I 2 . Measurements of transition frequencies, made over the frequency region 167-326 GHz and for JЉ up to 190, allowed determination of sextic level spectroscopic constants for all states. The changes in spectroscopic constants with vibrational excitation show very small anharmonicity, in spite of the very low frequency of this mode (121 cm Ϫ1 ). Vibrational excitation affects the moments of inertia in such a way that the planar moment P b , about the plane perpendicular to both ЄICI and ЄHCH, is practically invariant. Vibrational change in P c , the moment along the principal axis in the HCH plane and perpendicular to the ЄHCH bisector, has been successfully reproduced with an ab initio harmonic force field so that there is no discernible vibrational change in ЄHCH on excitation of ЄICI. Finally, the change in P a leads to estimated vibrational change of ϩ0.12°in the value of ЄICI itself.

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