TITLE:

Rotational analysis of the BaI C²Ð - X²Ó⁺ band system for the Dv=0 progression (v=0-12)

AUTHORS:

Leach, C.A.; Tsekouras, A.A.; Zare, R.N.; Dept. of Chem., Stanford Univ., CA, USA

PUBLICATION:

Journal of Molecular Spectroscopy, vol.153, no.1-2, p. 59-72, May-June 1992 23 Refs.

ABSTRACT:

High-resolution spectra of the P₁₂-, R₁-, P₂-, and R₂₁-branch members of the BaI C²Ð - X²Ó⁺ (v,v) bands with v=0, 1, 4, 8, and 12 have been recorded using selectively detected laser-induced fluorescence (SDLIF). In addition, transitions involving high J" levels have been observed by undispersed fluorescence in the P₁₂ and P₂ branches of the (0,0), (1,1), (2,2), and (3,3) bands, and near the bandheads in the P₁, Q₁₂, P₂₁, and Q₂ branches of the (0,0) band. These data are combined with earlier optical measurements of the same electronic band system by Johnson et al. (1981, 1985) and Zhao et al. (1991) and Zhao et al. (1991) and with microwave measurements of low J" levels for v=0-5 of the X²Ó⁺ state by Torring and Dobl. Spectroscopic constants are obtained for the C²Ð and X²Ó⁺ states using a weighted nonlinear least-squares fit to the optical and microwave transition wavenumbers, and bandhead positions for v<=12. The present set of 31 constants reproduces the positions of 5032 optical transitions with a standard deviation of 2.4x10^-3 cm^-1. No frequency perturbations are observed in the authors' data.