High-resolution FTIR spectroscopy of CH2D35Cl:: rovibrational analysis of the ν3, ν9 fundamentals and the 2ν6-ν6, ν5+ν6-ν5 hot bands

The infrared spectrum of CH(2)D(35)Cl has been measured on a Bomem Model DA3.002 Fourier transform spectrometer with a resolution of about 0.004 cm(-1) and interpreted in the regions of the nu(9) (987 cm(-1)) and nu(3) (1435 cm(-1)) fundamentals. The unperturbed transitions of the weak 9 band have been analysed with the Hamiltonian of Watson to give accurate spectroscopic constants of the excited state. The transitions of the medium nu(3) band have been processed with a model which accounts for Coriolis and Fermi resonances with the nu(6) = 2 state, located 16 cm(-1) below the fundamental level. The rovibrational energy levels of this state, otherwise dark, have been obtained from the perturbation-allowed transitions observed in the nu(3) region and through a deeper analysis performed in the 6 spectral range, where a number of weak features have been assigned to the 2 nu(6) - nu(6) and nu(5) + nu(6) - nu(5) hot bands. Some spectroscopic parameters, in terms of an unperturbed level, have also been obtained for nu(5) = nu(6) = 1. Ground state constants have been improved using ground state combination differences (GSCDs) assembled from a-, b- and c-type transitions of four fundamentals. These new values allowed in turn the revision of the spectroscopic parameters of the coupled nu(5) = 1 and nu(6) = 1 states.