The H2S spectrum in the 1·6 μm spectral region

Abstract

High resolution Fourier transform spectra have been used for an extensive analysis of the 2v ₁ + v ₂, v ₁ + v ₂ + v ₃ and v ₂ + 2v ₃ bands of H₂ ³²S and H₂ ³⁴S in the 6000–6500 cm^-1 region. Using a hamiltonian which takes explicitly into account the Coriolis interaction between the rotational levels of the (111) vibrational state with those of the (210) and (012) vibrational states together with the Darling-Dennison interaction between the (012) and the (210) states, it has been possible to reproduce satisfactorily the rotational energy levels of these three interacting states, and a precise set of vibrational energies and rotational and coupling constants has been derived. Moreover, individual intensities of transitions belonging to the 2v ₁ + v ₂, v ₁ + v ₂ + v ₃ and v ₂ + 2v ₃ bands of H₂ ³²S have been estimated, leading to the determination of the transition moment constants appearing in the expansion of the transformed transition moment operators of these three bands. Finally a complete listing of the positions and intensities of the H₂ ³²S and H₂ ³⁴S lines absorbing in the 1·6 μm region has been generated.