HIGH-RESOLUTION STUDY OF THE 2NU(5) HYBRID BAND OF THE CHD3 MOLECULE

The high-resolution infrared spectrum of CHD3 has been measured on a F ourier transform spectrometer and analyzed in the region of the 2 nu(5 ) hybrid absorption band, 2450-2810 cm(-1). Anomalously small A(1)-A(2 ) splittings of energy levels (J, K = 1, A(1,2)) and anomalously large A(1)-A(2) splittings of energy levels (J, K = 2, A(1,2)) in the E-typ e subband were observed. Energy levels were also observed for J greate r than or equal to 16 splittings of (J, K = 4, A(1,2)) These and other effects were described by strong Coriolis interactions between A(1)- and E-type vibrational subbands. A corresponding Hamiltonian model is derived. It reproduces the initial experimental data (J(max) = 22, K-a (max) = 22) with mean accuracy 2.7 X 10(-4) cm(-1), which is not far f rom experimental uncertainties. (C) 1996 Academic Press, Inc.