Spectroscopic constants for HCFC-22 from rotational and high-resolution vibration-rotation spectra: (CHF2Cl)-Cl-37 and (CHF2Cl)-C-13-Cl-35 isotopomers

The rotational spectrum of CHF2Cl in natural abundance has been measured over the frequency region 8-705 GHz and accurate sextic level constants in the rotational Hamiltonian have been determined for the ground states of the (CHF2Cl)-Cl-37 and the (CHF2Cl)-C-13-Cl-35 isotopic species. In addition, the rotational spectrum in the two lowest excited vibrational states, upsilon(9) = 1 and upsilon(6) = 1, of the (CHF2Cl)-Cl-37 isotopomer and the high-resolution infrared spectrum of relevant fundamental bands have been studied. Spectroscopic constants have been determined within the framework of the two axis, c- and a-type, Coriolis interaction which connects the two states. The constants in the rotational Hamiltonian for all states of naturally abundant CHF2Cl with room temperature population factors >4% are collected in this paper and allow accurate reproduction of its rotational spectrum well into the submillimeter-wave region. (C) 1997 Academic Press.