摘要
Rotationally resolved laser-induced fluorescence of biacetyl in A 1 A u -X 1 A g was analyzed. The difference between geometries of the methyl groups in the X 1 A g and A 1 A u states resulted in a long progression in the gearing and antigearing methyl torsions. Relatively large vibronic transition intensities were observed in both the 15 1 0 and 21 1 0 bands.