Abstract
The rotational analysis in the ground vibrational state has been carried out for CH3D by using the ground state combination differences. More than 1500 allowed and 2500 forbidden transitions from the fundamental bands ν3, ν5, and ν6were used to determine 12 rotational parameters, which reproduce the observed combination differences within an accuracy of 1.0 × 10−4cm−1. Altogether ten independenta1–a2(K= 3) splittings withJ≥ 10 in the vibrational ground state were observed and analyzed both with supercombination differences method [O. N. Ulenikov, S. Alanko, M. Koivusaari, and R. Anttila,Chem. Phys. Lett.268, 242–248 (1997)] and by generating energy levels from Hamiltonian. Problems in simultaneous determination ofϵ̃andh̃3constants responsible for such splittings are discussed.
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