“…For example, in the ground torsional state v 6 ϭ 0 of the ground vibrational state (gs) of CH 3 SiD 3 , the torsional splitting is on the order of 200 MHz (1). However, in the zero-point torsional state of the lowest frequency vibrational fundamental, unusually large -splittings were observed for CH 3 SiH 3 (2)(3)(4), CH 3 CD 3 (5), and CH 3 CH 3 (6). This effect was attributed to Coriolis-type coupling between the stacks of torsional levels in the two different vibrational states.…”