Characterization of the ground state of Br-2 by laser-induced fluorescence Fourier transform spectroscopy of the B-3 Pi(0+u)-X-1 Sigma(+)(g) system

The laser-induced fluorescence (LIF) spectrum of the B(3)Pi(0+u)-X(1)Sigma(g)(+) system of Br-2 was recorded by Fourier transform spectroscopy (FTS). The LIF spectra were obtained by using continuous-wave dye laser excitation in the spectral region 16 800-18 000 cm(-1). About 1800 rotationally resolved lines were recorded in 96 fluorescence progressions, originating from the 10 less than or equal to nu' less than or equal to 22 vibrational levels of the B(3)Pi(0+u) state and involving the 2 less than or equal to nu less than or equal to 29 levels of the X(1)Sigma(g)(+) ground state of the three isotopomers of bromine, Br-79(2), Br-81(2), and Br-79,81(2). These data, together with Br-79(2) data from a previous FTS absorption study [S. Gerstenkorn, P. Luc, A. Raynal, and J. Sinzelle, J. Phys. (France) 48, 1685-1696 (1987)], were analyzed to yield improved Dunham constants for the ground state. A Rydberg-Klein-Rees (RKR) potential energy curve was computed for the X(1)Sigma(g)(+) State (nu = 0-29). The equilibrium bond length was found to be Re(X(1)Sigma(g)(+)) = 2.2810213(20) Angstrom, (C) 2000 Academic Press.