Intermolecular potential for Ar-HBr (ν1 = 1) studied by high resolution near infrared spectroscopy uri icon

abstract

  • The fundamental ν1, combinations ν1 + 2ν02, ν1 + ν12, ν1 + ν3, ν1 + 2ν02 + ν3, hot band ν1 + 2ν02 - 2ν02, and difference band ν1 - 2ν02 have been analyzed rovibrationally for both 79Br and 81Br isotopomers in Ar-HBr. The bands involving 2ν02 directly sample the second minimum of the intermolecular potential surface of the complex, corresponding to the isomeric structure Ar-BrH. Nuclear quadrupole substructure has also been partially resolved in the Q branch transitions of the ν1 + ν12 band. In addition, a strong Coriolis perturbation between the ν1 + ν1e2 and ν1 + ν3 states was investigated. A model potential surface for Ar-HBr (HBr ν1, = 1) was derived and compared with the H4 intermolecular potential for Ar-HBr (HBr ν1 = 0).