The far-infrared spectrum of the HCl dimer
1989; Elsevier BV; Volume: 138; Issue: 1 Linguagem: Inglês
10.1016/0022-2852(89)90118-5
ISSN1096-083X
AutoresN. Moazzen‐Ahmadi, A. R. W. McKellar, J. W. C. Johns,
Tópico(s)Advanced Chemical Physics Studies
ResumoHigh-resolution (0.007 cm−1) spectra of the dimer (HCl)2 have been studied in the 40–200 cm−1 region using a Fourier transform spectrometer and a 20-m path through HCl at low temperature ( (⋍140 K) and pressure (⋍5 Torr). Five perpendicular c-type subbands have been rotationally analyzed and assigned to the (H35Cl)2 out-of-plane bending (torsional) vibration ν6, whose origin is determined to be 160.78 cm−1. One b-type subband has been analyzed and assigned as a rotation-tunneling transition between the ground (v5 = 0) and first excited (v5 = 1) tunneling states of (H35Cl)2. In addition to these bands, two subbands of the mixed isotope H35ClH37Cl have been rotationally analyzed, and four further subband origins have been located without a detailed analysis. The results give a detailed picture of the dependence of the B and C rotational parameters on v5, v6, and K. Excitation of the torsional vibration is found to result in a significant lowering of the tunneling barrier.
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