Infrared vibration rotation tunneling

Small water clusters have been the subject of intense theoretical and experimental interest over the last decade [118,306], due primarily to the advent of far-infrared vibration-rotation tunneling spectroscopy [307-310]. 

Cruzan, J. D., Brown, M. G., Liu, K., Braly, L. B., Saykally, R. J. (1996b). The far-infrared vibration-rotation-tunneling spectrum of the water tetramer-d8. Journal of Chemical Physics, 105, 6634-6644. 

Recent advances in spectroscopic methods have enabled the water pentamer to be studied experimentally. Infrared cavity ringdown spectroscopy has been used to examine the intramolecular absorption features of the gas-phase water pentamer, which match the spectral features of the pentamer rings in liquid water and amorphous ice (Paul et al., 1999 Burnham et al., 2002). Vibration Rotation Tunnelling (VRT) spectroscopy has been used to provide a more direct probe of the water pentamer intermolecular vibrations and fine structure in liquid water (Liu et al., 1997 Harker et al., 2005). The water pentamer was found to average out... 

CNPI = complete nuclear permutation inversion DMC = dififusion Monte Carlo DVR = discrete variable representation FIR = far infrared IR = irreducible representation MS = molecular symmetry PI = permutation inversion RM = rigid molecule VRT = vibration-rotation tunneling. 

In case of the related complex (HCl) comparatively few accurate spectroscopic investigations have been performed to date. Very recently, Blake et al. 713/ reported a far infrared rotation-tunnelling spectrum. In a related investigation Moazzen-Ahmadi et al. 714/ analyzed the torsional vibration of (HC1)2 Fundamental frequencies of the... 

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