Precise Study of the Lowest Vibration–Rotational Bands ν5and ν3/ν6of the CHD3Molecule

On the Rotational Analysis of the Ground Vibrational State of CH3D Molecule

“…(3). If we assume that ⑀ is on the same order of magnitude as the other quartic centrifugal distortion constants (Ϸ10 Ϫ4 cm Ϫ1 ), the condition [6] is well satisfied within the J range observed in this study.…”

The Near Degenerate ν3 and ν6 States of HSiD3 Revealing Δ(k − l) = 0, ±3, and ±6 Interactions

“…For HCD 3 many more parameters than for HSiD 3 and HGeD 3 are required to reach a quantitative fit as is evident from the ⌬ values for the energy levels, (Fit) not being quoted in (17). The spectra on which the analyses of the three species are based are of similar precision, and the highest values reached for BJ( J ϩ 1) in the three different studies are quite similar.…”

“…This 5 band is well isolated from the lower-lying pair 3 ( A 1 ) and 6 (E). According to force-field calculations 3 and 6 are strongly coupled by x, y-Coriolis interactions, in analogy to HCD 3 (17) and HGeD 3 (18). The supposed (6) accidental degeneracy of 3 and 6 , both with 0 ϭ 683 cm Ϫ1 , has never been confirmed and might be erroneous owing to strong intensity perturbations like those revealed by 3 and 6 of HGeD 3 , with ( 6 Ϫ 3 ) ϭ 30 cm Ϫ1 .…”

Study on the Rovibrational Interactions and a1/a2 Splittings in the ν3/ν5/ν6 Triad of CH3D

“…First, in all the abovementioned studies the model with degenerate a 1 /a 2 (K ϭ 3) states in the ground vibrational state was used. As our earlier analysis of the corresponding triad of CD 3 H (4,7) shows, the inclusion of these splittings in the ground state allows one to correctly explain numerous unusual peculiarities and splittings observed in the spectra. Also, one can expect that using the recent new information on the ground vibrational state of CH 3 D [Ref.…”

“…[8] of Ref. (4). In Table 4 of the present work this resonance is described by the ␣ and ␤ parameters.…”