Emission spectra of the (1)(1)Sigma(+)(u)-(1)(1)Sigma(+)(g) transition of B-2

Emission spectra of the (1)(1) Sigma(u)(+)-(1)(1) Sigma(g)(+) electronic transition of B-2 produced by discharging dilute mixtures of diborane followed by expansion through a corona excited supersonic expansion source have been recorded and analyzed for the first time. The spectra of the 0-0, 1-1, 2-2, 3-3, and 4-4 vibrational bands of this transition will be presented along with their rotational analyses. The molecular parameters that resulted from fitting the data to a Dunham-type expansion will be reported and compared with recent theoretical calculations. (C) 1995 Academic Press, Inc.