The ν12 Band of CH3SiD3

High-Resolution Far-Infrared Torsional Spectrum of CH3SiD3 Using a Synchrotron Source

“…In a recent work, we reported an infrared study of the ν 12 band of CH 3 SiD 3 (13). It was hoped that the bright state (v 12 = 1, v 6 = 0) could be used as a probe for the nearby dark levels with v 6 = 3 in the gs.…”

“…For ease of discussion, this approach is termed here the high-barrier model. The Hamiltonian H xy,ν 12 21 has been used extensively to characterize the intervibrational coupling in CH 3 SiH 3 (1), CH 3 SiD 3 (13), CH 3 CH 3 (19), and CH 3 CD 3 (20). However, this approach has the drawback that the term involving sin 3α does not emerge naturally in this order from the formal treatment of the expansion of the vibration-torsion-rotation Hamiltonian.…”

Infrared and Millimeter-Wave Study of the Four Lowest Torsional States of CH3CF3

“…These were given the names J 2 -v 6 exact and J 2 -v 6 first order. The J 2 -v 6 exact procedure is more precise and was used here, after having been adapted from work on the v 5 band of CH 3 SiH 3 (14). The J 2 -v 6 first-order procedure requires much less computer time; this was introduced in the analysis of the v 12 band of CH 3 SiH 3 (8).…”

“…For ease of reference, the earlier method will be termed J 2 -v 6 first order, while the current method will be termed J 2 -v 6 exact. The change from the former to the latter was instituted because of experience with the analysis of the 5 band of CH 3 SiH 3 (14), where it was found that the Fermilike resonance cannot be treated with the less accurate method. In the present work, a comparison of the results with the two procedures shows that some of the sextic parameters are affected by using the J 2 -v 6 first-order calculation.…”

“…The second section is the region 410 -419 cm Ϫ1 ; this includes the P-branch envelopes for JЉ from 12 to 36. The third section extends from 425 to 428.5 cm Ϫ1 and includes the envelopes from R(5) to R (14). The fourth section is from 429.9 to 435 cm Ϫ1 and includes envelopes R (19) to R(32).…”