HIGH-RESOLUTION ANALYSIS OF THE NU-2, 2-NU-2, NU-1, AND NU-3 BANDS OF (H2SE)-SE-80

High-resolution Fourier transform spectra of monoisotopic H280Se have been recorded in the 10- and 4.3-μm spectral regions where the ν2 and the 2ν2, ν1, and ν3 bands of this molecule absorb, respectively. The (0 1 0) rotational levels were least-squares fitted using a Watson-type Hamiltonian, whereas for the ((0 2 0), (1 0 0), (0 0 1)) interacting states it proved necessary to consider the strong Coriolis interaction coupling the (1 0 0) and (0 0 1) rotational levels as well as the weak Coriolis interaction coupling the (0 2 0) and (0 0 1) levels. In this way, all the experimental levels were calculated to within their experimental uncertainty and a precise set of vibrational energies and rotational and coupling constants was obtained for the (0 1 0), (0 2 0), (1 0 0), and (0 0 1) vibrational states of H280Se with the band centers, ν0 (ν2) = 1034.171498 (10) cm-1, ν0 (2ν2) = 2059.96709 (24) cm-1, ν0(ν1) = 2344.362750 (29) cm-1, and ν0(ν3) = 2357.653848 (31) cm-1. © 1993 Academic Press, Inc.