The main goal of the present study was to improve the already published rotational structure analysis of the ground vibrational state of the13CH3Dmolecule. To realise that,we recorded high-resolution spectra of a set of the strongly interacting vibrational bands, 2ν3(A1), 2ν6(A1), 2ν6(E), ν2(A1), ν5+ ν6(A1), ν5+ ν6(A2), 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 Jmax= 18, ΔJmax= 2 and Kmax= 15. The a1/a2splittings 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 drms= 0.00014 cm-1). The 21 highly accurate THz-region transitions which were also used as input data, are reproduced with drms= 47 kHz.
- Ground state rotational structure
- Monodeuterated methane
- Spectroscopic parameters
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Condensed Matter Physics
- Molecular Biology