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 CH2D35Cl 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 ν 9 (987 cm−1) and ν 3 (1435 cm−1) fundamentals. The unperturbed transitions of the weak ν 9 band have been analysed with the Hamiltonian of Watson to give accurate spectroscopic constants of the excited state. The transitions of the medium ν 3 band have been processed with a model which accounts for Coriolis and Fermi resonances with the ν6 = 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 ν3 region and through a deeper analysis performed in the ν6 spectral range, where a number of weak features have been assigned to the 2ν6 − ν 6 and ν5 + ν6 − ν 5 hot bands. Some spectroscopic parameters, in terms of an unperturbed level, have also been obtained for ν5 = ν6 = 1. Ground state cons...