INTERNAL ROTATION IN METHYL SILANE: A SEMIRIGID BENDER ANALYSIS

$^{1}$ N. Moazzen-Ahmadi, I. Ozier and H. Jagannath, J. Mol. Spectrose. 119, 299 (1986) and references therein. $^{2}$ E. Hirota, J. Mol. Spectrosc. 43, 36 (1972).Author Institution: Herzberg Institute of Astrophysics, National Research CouncilThere is a wealth of data on the energy levels associated with overall rotation and torsion of methyl $silane;^{1}$ so far these data have been analyzed by the principal axis method (PAM) or the internal axis method $(IAM).^{1,2}$ We will present here the application of the semirigid bender hamiltonlan in an attempt to interpret the existing data by using a few molecular parameters that have a straightforward physical meaning (bond lengths and bond angles, and their variations with the internal rotation angle), plus the usual potential energy expansion coefficients