LOCAL MODE EFFECTS ON THE HIGH-RESOLUTION OVERTONE SPECTRUM OF H2S AROUND 12500 CM(-1)

The overtone spectrum of HIS has been studied by intracavity laser abs orption spectroscopy in the wavenumber region 12270-12670 cm(-1). The rovibrational analysis has provided upper state rotational parameters for the three interacting vibrational states, (401), (104), and (024), observed in the region. The rotational levels of the first two states , constituting the local made pair 41. are strongly coupled by a stron g H-22 type interaction. The (024) state is observed via a local pertu rbation, Altogether, 399 rovibrational lints have been assigned, inclu ding 172 rotational upper state sublevels which have been reproduced c alculationally within the experimental accuracy of 0.015 cm(-1). A loc al mode type behavior is evidenced by the values of the rotational par ameters. (C) 1997 Academic Press.