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Microwave spectra of the (HF)2, (DF)2, HFDF, and DFHF hydrogen-bonded complexes

1987; Elsevier BV; Volume: 123; Issue: 2 Linguagem: Inglês

10.1016/0022-2852(87)90290-6

1096-083X

W. J. Lafferty, R. D. Suenram, F. J. Lovas,

Spectroscopy and Laser Applications

The microwave spectra of the tunneling-rotation bands of the hydrogen-bonded complexes (HF)2 and (DF)2 have been measured in the 50- to 126-GHz region. In addition, the pure rotation spectra of both the HFDF and DFHF molecules have been obtained. Transitions with K = 0 through K = 2 have been observed for all isotopic species. The hydrogen fluoride dimer is a very nonrigid molecular species. In order to fit the observed transitions adequately, empirical expressions for the energy levels were used, and each K subband was separately fitted. Constants obtained from a Padé approximant fitting of the microwave data of (HF)2 together with infrared ground state combination differences are given.