Studies on Molecular Systams Formed by Novel Interactions

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(1) Rotational Spectrum and Molecular Structure of the Silane-Water ComplexWe observed the rotational spectra which completely differ from those reported for complexes containing a T_d symmetry molecule. The observed data led to the conclusions that the complex is of completely new type with a short and hard Si-O distance and that the main internal motion is the internal rotation around the Si-O axis. It was also suggested that small splittings observed for each rotational line are caused by the internal motion of silane.(2) Rotational spectrum of the Silane-Argon ComplexThe spectrum was measured for both SiH_4-Ar and SiD_4-Ar. The A and E components of the former appeared in the order opposite to that normally expected. Several sets of potential functions were assumed for the silane-argon interaction in order to explain the observed splittings of the spectra, but the anomalous dependence of the splittings on isotopic species has not been explained.(3) Analysis of the B-X Transition of Na_3A Hamiltonian for the pseudo-rotation in the B state was derived based upon a group-theoretical consideration and was applied to the analysis of the observed spectra. Seven parameters included in the Hamiltonian reproduced the observed spectra with the standard deviation of 0.012 cm^<-1>.(4) Analysis of the Methanol DimerTransition involving 16 K=0 levels and 32 K=1 levels were successfully analyzed, resulting in determination of four kinds of tunneling splittings.