An investigation of three-body effects in intermolecular forces III: Far infrared laser vibration—rotation—tunneling spectroscopy of the lowest internal rotor states of Ar2HCl
The c-type intermolecular out-of-plane bend of Ar2HCl has been observed at 45.2 cm-1, completing the high resolution far infrared measurements of the three lowest-lying Ar2HCl bending states which correlate to the j=1 internal rotational state of the HCl monomer. The rotational and nuclear quadrupole hyperfine structures indicate the existence of a Coriolis perturbation. The perturbing state is postulated to be a heavy-atom stretching overtone that is very nearly degenerate with the out-of-plane bend. A partial reassignment of the previously reported [J. Chem. Phys. 95, 3182 (1991)] Ar2HCl in-plane bend is presented and a treatment of Coriolis effects between the in-plane and Sigma bends is discussed. Comparison with dynamically rigorous calculations presented in the accompanying paper [J. Chem. Phys. 98, 5337 (1993)] indicate substantial three-body contributions to the intermolecular potential, which should be determinable from the data presented in this paper.
Elrod, M.J., J.G. Loeser, and R.J. Saykally. 1993. "An Investigation of Three-Body Effects in Intermolecular Forces III: Far Infrared Laser Vibration—Rotation—Tunneling Spectroscopy of the Lowest Internal Rotor States of Ar2HCl." Journal of Chemical Physics 98: 5352.
Journal of Chemical Physics
Chemistry and Biochemistry
Three-body problem, Intermolecular forces, Infrared spectra, Far infrared radiation, Laser spectroscopy, Vibrational states, Rotational states, Reorientation, Argon complexes, Hydrochloric acid, High-resolution methods, Hyperfine structure, Nuclear quadrupole resonance, Coriolis force, Harmonics