THE ABSORPTION-SPECTRUM OF H2S BETWEEN 2150-CM(-1) AND 4260-CM(-1) - ANALYSIS OF THE POSITIONS AND INTENSITIES IN THE FIRST (2-NU(2)-TRIAD,NU(1)-TRIAD, AND NU(3))-TRIAD AND 2ND (3-NU(2)-TRIAD, NU(1)-TRIAD, AND NU(2)+NU(3))-TRIAD REGIONS(NU(2))

The two triad systems of hydrogen sulfide (2 nu(2), nu(1) and nu(3) ne ar 4 mu m and 3 nu(2), nu(1), + nu(2), and nu(2) + nu(3) near 2.7 mu m ) were analyzed using 14 spectra recorded at 0.0056 and 0.011 cm(-1) r esolution with the McMath Fourier transform spectrometer located at Ki tt Peak National Observatory. Experimental upper stare levels of (H2S) -S-32, (H2S)-S-34, and (H2S)-S-33 were obtained from assigned position s (as high as J = 20 and k(d) = 15 for the main isotope). These were f itted to the A-reduced Watson Hamiltonian to determine precise sets of rotational constants through J(10) and up to nine Fermi and Coriolis coupling parameters. Intensities of the two (H2S)-S-32 triads were mod eled with rms values of 2.5%, using the transformed transition moment expansion with 19 terms for 568 intensifies of the first triad and 11 terms for the 526 intensities of the second triad. The second derivati ves of the dipole moment with respect to normal coordinates were estim ated in Debye to be: (22)mu(x), = -0.004873 (90); (12)mu(x) = 0.01372 (30); and (23)mu(z) = 0.01578 (30). This confirmed that for hydrogen s ulfide some of the second derivatives are larger than the first deriva tives. The calculated line intensities were summed yielding integrated band strengths (in cm(-2)/atm at 296 K) as follows: 0.3315 for 2 nu(2 ), 0.4522 for nu(1), 0.1201 for nu(3), 0.0303 for 3 nu(2), 1.820 for n u(1) + nu(2), and 2.869 for nu(2) + nu(3). In addition, the hot band t ransitions were identified in both regions. Finally,a composite databa se of hydrogen sulfide lint parameters was predicted for the 5- to 2.5 -mu m region. (C) 1998 Academic Press.