High resolution FT absorption spectrum of H₂S in the near IR region from 10015 to 10323 cm^-1 recorded at Kilt Peak National observatory, USA, has been analyzed for the first time. Three interacting vibrational states: (103), (004), and (400) belonging to the first pentadecade were considered. For the spectrum analysis the Watson-type rotational Hamiltonian which takes into account the resonance interaction between involved vibrational states has been used. One hundred forty four energy levels were reproduced from the fit with an average accuracy of 0.003 cm^-1 for the main isotope species using a set of 27 rotational and coupling parameters. New evaluation ofthe band origin of the dark (400) state: E = 10292.493 cm^-1 has been obtained from the fit to the upper state experimental energy levels which agrees well with the value of the band origin calculated using the effective vibrational Hamiltonian [1]. As a result, the H₂S absorption spectrum was completely analyzed in region under study. The calculated line positions and transition intensities are presented in the "ATMOS" information system. The obtained data on the hydrogen sulfide absorption represent valuable information for investigation ofhighly excited states of H₂S molecule.

Date Published: 21 April 2006
PDF: 6 pages
Proc. SPIE 6160, Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 616005 (21 April 2006); doi: 10.1117/12.675184

Published in SPIE Proceedings Vol. 6160:
Twelfth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics
Gelii A. Zherebtsov; Gennadii G. Matvienko, Editor(s)