Abstract
The main goal of the present study was to improve the already published rotational structure analysis of the ground vibrational state of the 13CH3D molecule. To realise that, we recorded high-resolution spectra of a set of the strongly interacting vibrational bands, 2ν3(A 1), 2ν6(A 1), 2ν6(E), ν2(A 1), ν5 + ν6(A 1), ν5 + ν6(A 2), ν5 + ν6(E) and ν3 + ν6(E). From the analysis of the experimental data, more than 1900 ground state combination differences (GSCD) were determined with , and . The a 1/a 2 splittings of the states with quantum number K = 3 were taken into account. The presence of numerous forbidden transitions allowed us to determine with high accuracy GSCD not only with ΔK = 0, but with ΔK = ±1, ±2 and ±3, as well. Spectroscopic parameters of the ground vibrational state were determined from the joint fit of the obtained GSCD (they are reproduced with cm−1). The 21 highly accurate THz-region transitions which were also used as input data, are reproduced with kHz.
Notes
aExperimental values reproduced from Ref. [30].
bDifferences between values of experimental transitions and corresponding values calculated with the obtained set of spectroscopic parameters from column 2 of Table 2.
cValues of differences reproduced from Ref. [30].
dDoublet should be here in accordance with the theory. The lines were not experimentally resolved in Ref. [30].
aValues in parentheses are one standard deviation given in units of the last digit. Values that are presented without standard deviation have been fixed to the values from Ref. [28].