H280Se: High-Resolution Study of the 2ν1 + ν2, ν1 + ν2 + ν3, 3ν1, 2ν1 + ν3 and ν1 + 2ν3 Bands

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

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 449 KB
• Volume: 168
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1994.1301

✦ Synopsis

Using high-resolution Fourier transform spectra of monoisotopic (\mathrm{H}{2}{ }^{80} \mathrm{Se}) recorded in the 1.8 and (1.55-\mu \mathrm{m}) regions. an extensive analysis of the (2 \nu{1}+\nu_{2}, \nu_{1}+\nu_{2}+\nu_{3}, 3 \nu_{1}, 2 \nu_{1}+\nu_{3}), and (\nu_{1}+) (2 v_{3}) bands of this molecule has been performed, leading to a precise set of rotational levels for its ({(210),(111)}) and ({(300),(201),(102)}) vibrational states. For the first set of states, it was necessary to introduce the undetected (012) state in the Hamiltonian model. and the observed levels of ({(210),(111)}) were least-squares fit using a Hamiltonian which takes explicitly into account both the Coriolis interactions between the levels of (210) and (111) and of (111) and (012), and the Darling-Dennison interaction between the levels of (210) and (012). For the second set of states, namely, ({(300),(201),(102)}), the same type of situation occurs and it was necessary as well to introduce in the model the (0)3) vibrational state. In this way, all the experimental levels of ({(210),(111)) and ({(300),(201),(102)}) were calculated almost to within their experimental uncertainties and a precise set of vibrational energies and rotational and coupling constants was derived with the hand centers (v_{0}\left(2 v_{1}+v_{2}\right)=5612.7107 . v_{0}\left(v_{1}+v_{2}+v_{3}\right)=) (5613.7546, \nu_{0}\left(3 v_{1}\right)=6953.4607, v_{0}\left(2 v_{1}+v_{3}\right)=6798.2084). and (v_{0}\left(v_{1}+2 v_{3}\right)=6798.0967) (\mathrm{cm}^{-1}). cl 1994 Academic Press. Inc.