Vibrational spectra and force constants of symmetric tops: High-resolution spectra of H374Ge35Cl in the region near 2100 cm?1 |
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Authors: | F Lattanzi C di Lauro H Bürger R Eujen S Cradock |
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Institution: | Dipartimento di Chimica, Università della Calabria, I-87030 Arcavacata di Rende Cosenza, Italy;Cattedra di Chimica Fisica, Istituto di Chimica Farmaceutica, Università di Napoli, I-80138 Naples, Italy;Anorganische Chemie, FB 9, Universität, D-5600 Wuppertal, West Germany;Department of Chemistry, University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, Scotland |
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Abstract: | The gas-phase infrared spectrum of monoisotopic H374Ge35Cl has been studied in the ν1, ν4 region near 2100 cm?1 with a resolution of 0.008 cm?1. Rotational fine structure for ΔJ = ±1 branches has been resolved for both fundamentals. ν1 (a1), 2119.977 03(19) cm?1; and ν4 (e), 2128.484 65(8) cm?1 are weakly coupled by Coriolis x,y resonance, Bξ1,4y 2.6 × 10?3 cm?1, and l-type resonance within ν4, q4(+) ?8.4 × 10?6 cm?1, has been observed. An extended Fermi resonance with ν5±1 + 2ν6±2, which mainly affects the kl = ?14 and ?15 levels of ν4, has been detected and analyzed. In addition, several weak and local resonances perturb essentially every K subband of ν4 and some of ν1, and a qualitative model is proposed to account for the features observed in the spectrum. Disregarding the transitions involved in local perturbations, the rms deviation of the fit to the remaining 2021 lines is σ = 1.34 × 10?3 cm?1. |
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