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 |
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Authors: | Focsa Li Bernath |
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Institution: | Department of Chemistry, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada |
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Abstract: | 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 = v' = 22 vibrational levels of the B(3)Pi(0(+))(u) state and involving the 2 = v" = 29 levels of the X(1)Sigma(+)(g) ground state of the three isotopomers of bromine, (79)Br(2), (81)Br(2), and (79,81)Br(2). These data, together with (79)Br(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 (v" = 0-29). The equilibrium bond length was found to be R(e)(X(1)Sigma(+)(g)) = 2.2810213(20) ?. Copyright 2000 Academic Press. |
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