TORSIONAL AND STRETCHING FUNDAMENTAL VIBRATIONAL-STATES OF (HSSH)-S-34

Millimeter-wave, submillimeter-wave, and infrared FT transitions perta ining to the ground state and the excited stretching and torsional vib rational states of-the disulfane isotopomer (HSSH)-S-34-S-32 have been measured, assigned, and analyzed. Analogously to the standard isotopo mer (HSSH)-S-32-S-32, a significant Coriolis interaction between the e xcited vibrational states has been observed and analyzed using an effe ctive Hamiltonian explicitly involving Coriolis coupling operators bet ween the excited states. The simultaneous analysis of all data has pro vided effective molecular parameters of the ground and excited vibrati onal states, which makes possible a full quantitative description of a ll transition wavenumbers. The stretching vibrational energy, which is hidden because of a negligible transition dipole moment, has been est imated from an analysis of the Coriolis and very weak nonorthorhombic vibration-rotation interactions. In addition to this, b-type rotationa l transitions, which are becoming intense as a consequence of an asymm etric isotopical substitution of S-34, have also been assigned in the millimeter-wave spectra. (C) 1996 Academic Press, Inc.