Hydrogen sulfide absorption spectrum in the 5700-6600 cm-1 spectral region

High resolution FT absorption spectrum of H2S from 5700 to 6600 cm(-1) was experimentally recorded and theoretically treated. As a result of the spectrum assignment I 100 precise energy levels were derived for the 2nd hexad interacting states of (H2S)-S-32, (H2S)-S-33, and (H2S)-S-34 isotope species including the highly excited (050) state. These energy levels were modeled using Watson-type rotational Hamiltonian and taking into account Coriolis, Darling-Dennison and weak Fermi-resonance interactions inside polyad of interacting states. An average accuracy of the energy levels fitting is of 0.0019 cm(-1) for the main isotope species. New evaluation of the band origin of the dark (012) state E-v = 6385.299 cm(-1) is obtained from the fitting process which agrees well with recent prediction by Naumenko et al. (J. Mol. Spectrosc. 50, 100-110 (2001)). Precise line intensity measurements were performed for more than 1200 absorption lines with accuracy varying from 1 to 7%. These intensities were modeled within 3.3% using wavefunctions derived in the process of the energy levels fitting. The transformed transition moment expansion with 29 terms for 1088 intensities was used. Detailed and accurate H2S absorption line list was generated in the HITRAN format for the analyzed spectral region.