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The ν2 Bands of the Deuterated Species D2Se and HDSe

✍ Scribed by W. Jerzembeck; H. Bürger; J.-M. Flaud; Ph. Arcas

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 247 KB
Volume: 197
Category: Article
ISSN: 0022-2852
DOI: 10.1006/jmsp.1999.7925

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✦ Synopsis

For the first time D 2 Se and HDSe as 80 Se monoisotopic and natural material were studied in the region of the 2 fundamental vibration by high-resolution (0.0033 cm Ϫ1 ) Fourier transform infrared spectroscopy. For D 2 Se which is an asymmetric rotor with C 2v symmetry the 2 band is of B type while for HDSe (C s symmetry) it is a hybrid band, and both A-and B-type transitions were observed. Depending on the isotopic abundances, 300 -1000 lines were assigned for each of the isotopic M Se species (M ϭ 76, 77, 78, 80, and 82). The corresponding (010) experimental rotational levels, obtained by adding the observed line positions to the ground state levels derived from J.-M. Flaud, Ph. Arcas, O. N. Ulenikov, G. A. Onopenko, N. E. Tyabaeva, W. Jerzembeck, and H. Bu ¨rger, (J. Mol. Spectrosc., in press) were fitted satisfactorily using a Watson-type Hamiltonian in A reduction and I r -representation: the rms deviations are ranging from 1.5 to 4.3 ϫ 10 Ϫ4 cm Ϫ1 depending on the isotopic species. Hamiltonian constants up to high order (octic terms) were determined for each isotopic species. For the most abundant Se isotopic species, namely 80 Se, the band centers are 0 (D 2 80 Se) ϭ 741.67503 cm Ϫ1 and 0 (HD 80 Se) ϭ 900.43820 cm Ϫ1 .

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