A CHARACTERIZATION OF THE CH2 A)OVER-TILDE(1)A(1)(1,2,0),(2,0,0),(0,5,0),(1,3,0) AND ER-TILDE(1)B(1)(1,14(2),0),(0,18(0),0),(0,19(1),0) VIBRONIC LEVELS BY FOURIER-TRANSFORM DISPERSED FLUORESCENCE SPECTROSCOPY

The CH2 (a) over tilde(1)A(1), (1, 2, 0), (2, 0, 0), (0, 5, 0), (1, 3, 0) and (b) over tilde(1)B(1) (1, 14(2), 0), (0, 18(0), 0), (0, 19(1), 0) levels are characterized by Fourier-transform dispersed fluorescen ce spectroscopy (FTDFS). Rotational transitions in the (b) over tilde <-- (a) over tilde 1 (1)(0)2(0)(14), 2(0)(18), and 2(0)(19) fluorescen ce excitation bands and those of the (b) over tilde --> (a) over tilde 1(1)(0)2(2)(16), 1(1)(0)2(2)(17), 1(2)(0)2(0)(16), 2(5)(18), 2(5)(19) , 1(1)(0)2(3)(18) and 1(1)(0)2(3)(19) bands in dispersed fluorescence spectra have been assigned. The rotational constants and vibrational t erm values for these vibrational levels have been obtained. Due to the limits brought by Renner-Teller coupling and Franck-Condon factors, t his work, along with previous studies on lower vibrational levels, has characterized almost all (a) over tilde vibrational levels detectable in the (b) over tilde) <-> (a) over tilde transitions. (C) 1994 Acade mic Press, Inc.