THE H2S SPECTRUM AROUND 0.7 MU-M

The overtone spectrum of H2S has been recorded by intracavity laser sp ectroscopy in the 14100-14400 cm(-1) spectral region. The rovibrationa l analysis was performed allowing one to assign not only lines involvi ng the pair of interacting states {(402), (303)} {(60(+), 0), (60(-), 0)} in local mode notation), but also lines involving the interacting states {(322), (223)} ({(50(+), 2.), (50(-), 2)} in local mode notatio n). Indeed, apart from the strong H-22 interactions that link the rota tional levels of the states (60(+/-), 0) on the one hand, and the rota tional levels of the states (50(+), 2) on the other hand, we observe t hat the rotational levels of the two pairs of states interact strongly through anharmonic and Coriolis-type resonances. These resonances tra nsfer intensity to lines involving the (50+, 2) pair of states. Altoge ther 80 rotational upper-state levels have been observed and reproduce d satisfactorily using an Hamiltonian matrix that takes explicitly int o account the various interactions and assumes the same vibrational en ergy and rotational constants for the two components of the local mode pairs. The following band centers have been obtained: v(o) (60(+), 0) = 14291.122 cm(-1) and v(o) (50(+/-), 2) = 14284.705 cm(-1). Finally a local mode-type behavior is evidenced by the values of the Hamiltoni an constants, and refined vibrational local mode parameters are obtain ed. (C) 1998 Academic Press.