Rotational analysis of the ν1, 2ν1 and 5ν1 stretching bands of HGeD3 |
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Authors: | Y Ding H Bürger |
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Institution: | a Laboratoire de Spectrométrie Physique (associated with CNRS UMR 5588), Université Joseph Fourier de Grenoble, B.P. 87, Saint Martin d’Hères 38402, France b Anorganische Chemie, FB 9, Universität, Wuppertal D-42097, Germany |
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Abstract: | The high-resolution spectrum of the ν1=5 stretching overtone of gaseous H70GeD3 has been recorded by an intracavity laser absorption spectrometer based on a vertical external cavity surface emitting laser (VECSEL). The rotational structure of the excited state at 9874.605 cm−1 was found weakly perturbed by unidentified interaction with dark states. Finally, of the 313 lines rotationally assigned, 239 lines were found unperturbed and could be reproduced with a root-mean-square (rms) deviation of 0.012 cm−1. The retrieved set of rotational parameters agrees with the values extrapolated from the previously studied ν1=6-8 stretching overtones. High-resolution FTIR spectra of the ν1 and 2ν1 bands have also been recorded and analyzed. The ν1=1 level, (νeff=2114.15 cm−1) is in anharmonic interaction with a further A1 symmetry level (νeff=2102.39 cm−1). The potential coupling term could be estimated (Wanh=5.6(3) cm−1) and the most probable assignment of the perturber is ν2+ν3. Moreover both levels are rotationally perturbed in an irregular fashion. Only a coarse analysis up to J=6 could be performed. The 2ν1 band reveals irregular perturbations of medium intensity by unknown dark states for almost all K values. Nevertheless the obtained leading rovibrational parameters of the 2ν1 band for J?6 are in agreement with those of the ν1=5-8 states. |
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