Abstract
The laser-induced fluorescence (LIF) spectrum of the B3Π0+u–X1Σ+g system of Br2 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 ≤ v′ ≤ 22 vibrational levels of the B3Π0+u state and involving the 2 ≤ v" ≤ 29 levels of the X1Σ+g ground state of the three isotopomers of bromine, 79Br2, 81Br2, and 79,81Br2. These data, together with 79Br2 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 X1Σ+g state (v" = 0–29). The equilibrium bond length was found to be Re(X1Σ+g) = 2.2810213(20) Å.
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