Abstract
The rotational spectra of the two isotopomers (CH 4, H 79Br) and (CH 4, H 81Br) of a weakly bound dimer formed between methane and hydrogen bromide have been observed by pulsed-nozzle, Fourier-transform microwave spectroscopy. The spectra are of the symmetric-top type, but with the K=0 transition exhibiting a vibrational satellite. Observed spectroscopic constants are interpreted in terms of a C 3v equilibrium geometry in which HBr forms a hydrogen bond to one of the four equivalent faces of the methane tetrahedron and lies along one of the methane C 3 axes. The vibrational satellite is associated with internal rotation of the CH 4 subunit which exchanges the site of hydrogen-bonding between the four methane faces.
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