# THE $v_{2}$ AND $v_{5}$ INFRARED BANDS OF $H_{3}Si^{79}Br$

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 Title: THE $v_{2}$ AND $v_{5}$ INFRARED BANDS OF $H_{3}Si^{79}Br$ Creators: Ceausu, A.; Graner, G.; Bürger, H.; Pracna, P. Issue Date: 1995 Publisher: Ohio State University Abstract: The $v_{2} (A_{1})$ and $v_{5}$ (E) fundamental bands of isotopically pure $H_{3} Si^{79}$ Br, centered at 929.752 and $946.427 cm^{-1}$ respectively have been analyzed from a high resolution Fourier transform spectrum in order to improve a former $work^{1}$. These two bands strongly interact through a X-Y Coriolis resonance. We also included in the model the weak Coriolis resonance between $v_{5}$ and $2v_{3}$, with a crossing near $k\ell = -13$ and K = 14, the r-type $\ell(2. - 1)$ resonance between $k\ell = 2$ and $k\ell = -3$ of $v_{5}$, with a crossing at J = 58 and the accidental resonance $\ell (1. - 2)$ between the $(k\ell = 1.A^{2})$ levels of $v_{5}$ and $(K = 3, A^{2})$ of $v_{2}$. We made a global fit of 4200 wavenumbers for $v_{2}$ and $v_{5}$ and 630 upper state energies of $v_{3} = 2$, deduced from previously $determined^{2}$ transitions of $2v_{3} - v_{3}$ and of $v_{3}$. A few perturbation allowed transitions were also included in the fit, which gives a s. d. on residuals better than $0.00015 cm^{-1}$. A set of molecular parameters for all levels involved will be reported. Description: 1. H. Bürger, H. Beckers, and J. Kauppinen. J. Mol. Spectrosc. 108, 215 (1984) 2. A. Ceausu, G. Graner, H. Bürger, E.B. Mkalhri, J. Ccaleou and A. G. Lesarri, J. Mol. Spectrosc, (1995) (in press). Author Institution: associé aux Universités P. et M. Curie et Paris. Sud, Bât 350, Campus d'Orsay. 91405 Orsay, France.; Universität Gesamthochschule, FB9, 42097 Wappertal, Germany.; J. Heyrovsky Institute of Physical Chemistry, Dolejskova 3, 18223 Praha 8. Czech Republic. URI: http://hdl.handle.net/1811/29568 Other Identifiers: 1995-RA-02