Tunnelling rotational

H1] Qiu Y and Bai Z 1998 Vibration-rotation-tunneling dynamics of (HF)2 and (HCI)2 from fulldimensional quantum bound state calculations Advances in Moiecuiar Vibrations and Coiiision Dynamics, Voi. i-ii Moiecuiar dusters ed J Bowman and Z Bai (JAI Press) pp 183-204... 

Liu K, Brown M G and Saykally R J 1997 Terahertz laser vibration rotation tunneling spectroscopy and dipole moment of a cage form of the water hexamer J. Phys. Chem. A 101 8995-9010... 

Figure Bl.4.9. Top rotation-tunnelling hyperfine structure in one of the flipping inodes of (020)3 near 3 THz. The small splittings seen in the Q-branch transitions are induced by the bound-free hydrogen atom tiiimelling by the water monomers. Bottom the low-frequency torsional mode structure of the water duner spectrum, includmg a detailed comparison of theoretical calculations of the dynamics with those observed experimentally [ ]. The symbols next to the arrows depict the parallel (A k= 0) versus perpendicular (A = 1) nature of the selection rules in the pseudorotation manifold.

Liu K, Brown M G, Cruzan J D and Saykally R J 1996 Vibration-rotation tunnelling speotra of the water pentamer Science 271 62-4... 

Fig. 57. The INS structure factor at different temperatures for rotational tunneling in a (CH3)2SnCl2 crystal.

Tetramethylplumbane mixtures with tetramethylstannane were studied at 2 K by high resolution INS (inelastic neutron scattering), revealing rotational tunnelling transitions for the methyl groups146. 

Fully Coupled Six-Dimensional Calculations of the Water Dimer Vibration-Rotation-Tunneling States with a Split Wigner Pseudo Spectral Approach. 

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... 

Figure 7.14. INS spectra for rotational tunneling in (CH3)2SnCl2 crystal at different temperatures. (From Wurger and Heidemann [1990].)...

VIBRATION-ROTATION TUNNELING SPECTROSCOPY OF MOLECULES AND DIMERS... 

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