High-Resolution Analysis of the ν1 + 2ν2, 2ν2 + ν3, 2ν1, ν1 + ν3, and 2ν3 Bands of H280Se

✍ Scribed by J.M. Flaud; C. Camypeyret; P. Arcas; H. Burger; H. Willner

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 550 KB
• Volume: 165
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1115

✦ Synopsis

High-resolution Fourier transform spectra of monoisotopic (\mathrm{H}_{2}{ }^{\text {k0 }}) Se have been recorded with a resolution of (7 \times 10^{-3} \mathrm{~cm}^{-1}) in the (4210-4850 \mathrm{~cm}^{-1}) spectral range. Their rovibrational analysis

and ((002)) vibrational states of this molecule. To fit these levels satisfactorily it proved necessary to take explicitly into account in the Hamiltonian not only the strong Coriolis and DarlingDennison interactions coupling the rotational levels of the ({(200),(101),(002)}) vibrational states and the strong Coriolis interaction coupling the levels of (\left{\begin{array}{lll}1 & 20\end{array}\right)). (02 (\left.(1)\right}), but also weak interactions linking the rotational levels of these two groups of vibrational states; indeed for (J) values around 15 and above, there appear crossings between the levels despite the differences in the bandcenters. In this way, all the experimental levels were satisfactorily calculated and a precise set of vibrational energies and rotational and coupling constants was obtained for the five vibrational states ( 120(),(021),(200)), ( 101 ). and ( 002 ) of (\mathrm{H}{2}{ }^{80} \mathrm{Se}) with the following bandcenters: (v{0}) (\left(\nu_{1}+2 \nu_{2}\right)=4370.60800 \mathrm{~cm}^{-1}, \nu_{0}\left(2 \nu_{2}+\nu_{3}\right)=4377.61844 \mathrm{~cm}^{-1}, \nu_{0}\left(2 \nu_{1}\right)=4615.32816 \mathrm{~cm}^{-1}), (v_{0}\left(v_{1}+\nu_{3}\right)=4617.39318 \mathrm{~cm}^{-1}), and (v_{0}\left(2 v_{3}\right)=4702.54744 \mathrm{~cm}^{-1}). (c) 1994 Academic Press. Inc.