SIMULTANEOUS ANALYSIS OF THE 2-NU(2), NU(1), AND NU-V(3) BANDS OF HYDROGEN TELLURIDE

Spectra of a natural sample of hydrogen telluride as well as a spectru m of monoisotopic H-2 Te-130 have been recorded by means of Fourier tr ansform spectrometry with a resolution of 0.003 cm(-1) in the spectral domain 7.5-4.3 mu m where it is easy to observe the main absorbing ba nds nu(1) and nu(3). We have located and assigned for the first time t he 2 nu(2) band which appears in the lower wavenumber range of the rec orded spectral domain near 1700 cm(-1). It proved necessary to treat s imultaneously the three states (020), (100), and (001), nu(1) and nu(3 ) are indeed Coriolis-coupled vibration-rotation bands and it was obse rved that a few rotational levels of (001) could not be fitted to with in their experimental accuracy without considering the second-order Co riolis interaction between the rotational levels of (020) and (001). I n this way all the experimental levels were calculated to within the e xperimental uncertainty, and precise sets of vibrational energies and rotational and coupling constants were obtained for the seven most abu ndant H2Te isotopic species, namely H-2 Te-130, H-2 Te-128, H-2 Te-126 , H-2 Te-125, H-2 Te-124, H-2 Te-123, and H-2 Te-122. For the most abu ndant isotopic species H-2 Te-130 the bands centers are nu(0)(2 nu(2)) = 1715.9568, nu(0)(v(1)) = 2065.2709, nu(0)(nu(3)) = 2072.1101 cm(-1) . (C) 1997 Academic Press.