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MAUSUMI GOSWAMI AND E. ARUNAN, Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India.
The rotational spectra of C2D4-H2S, C2D4-HDS, C2D4-D2S and 13CCH4-H2S isotopomers have been measured. The spectra for C2D4-H2S, C2D4-D2S and 13CCH4-H2S show four line pattern as was observed for the parent species [1]. C2D4-HDS shows doubling of transitions. These data combined with our earlier data of C2H4-H2S, C2H4-HDS, C2H4-H234S and C2H4-D2S confirm that the smaller splitting (0.14 MHz in (B+C)/2 for the parent isotopomer) arises from the tunneling of ethylene hydrogens whereas the larger spilitting (1.67 MHz in (B+C)/2 for the parent isotopomer) arises from the interchange of equivalent hydrogens of H2S. The splittings observed for various isotopic substitutions confirm that the dynamics of both these motions involve both ethylene and hydrogen-sulphide. Molecular symmetry group analysis has been performed where both ethylene and hydrogen motions have been considered. The experimental intensity patterns are consistent with the calculated statistical weights.
\bigskip 1. E. Arunan and co-workers, Chem. Phys. Lett. , 393, 2004, \textbf22.