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Volume 111, Issue 14, 08 October 1999
111(1999); http://dx.doi.org/10.1063/1.480013View Description Hide Description
Laser-induced fluorescencespectra of the transition of biacetyl are observed under supersonic jet condition. Three weaker bands have been observed at 154, 67, and 58 cm−1 to the red of the previously presumed band origin (at 22 336 cm−1). The observed tunneling splitting 1.05 cm−1 for the band and 1.68 cm−1 for the band are compared to the theoretical result. Based on the tunneling splitting, the true band origin is determined for the first time as the furthest weaker band at 22 182 cm−1. The three weaker bands have been assigned as and transitions, respectively.