Microwave and sub-mmwave study of CH3SiH3 including the perturbation-allowed torsion–vibration difference band (ν12=0,ν6=3)↔(ν12=1,ν6=0)

High resolution infrared spectrum and global analysis of ν5, ν12, and ν12+ν6−ν6 in CH3SiH3

“…This is to be contrasted with the most recent previous analysis in Ref. [3], where the sextic constants in m 5 were fixed at zero. The HB and FR models differ in the way the coupling between the torsional stacks of levels in degenerate and non-degenerate modes are treated.…”

“…Note that the some of the values for J max and K max given in Table 1 of Ref. [3] are in error by unity. For the components common to both works, these values have been corrected here in Table 2, with K max replaced by G max .…”

“…The remainder of the data set has been taken over from that analysed in the most recent previous study; see Table 1 of Ref. [3]. The older data include the torsional bands v 6 = 2 0 (j = 6) and v 6 = 3 1 (j = 7).…”

“…See Table 1 9282 1291.4 Totals for 45 parameter FR model of Ref. [3]. See Table 1 3423 742. c Maximum values included in the data set.…”

“…In addition to the infrared study, the Fourier transform microwave investigation at the Eidgenössische Technische Hochschule reported in Ref. [3] has been extended. The three r-components of the (J = 1 0) transition in the level m 12 + m 6 have been measured, along with nine direct l-doubling transitions for r = 0 in m 12 + m 6 .…”