Jet Spectroscopy of the D1 22B1-D0 12B1 Transition of the p-Cyanobenzyl Radical
We have generated the p-cyanobenzyl radical in supersonic free expansion, and measured the vibrationally and rotationally resolved laser induced fluorescence (LIF) excitation spectra and the LIF dispersed spectra from the single vibronic levels (SVL) in the green-blue region. The lowest energy band at 20 738 cm-1 with the strongest intensity in the excitation spectrum has been assigned to the 0(0)0 band of the visible spectrum, on the basis of the vibronic structures in the SVL dispersed spectra. Based on the band type of the 0(0)0 band, a-type, determined from the rotationally resolved LIF excitation spectrum, we have definitely assigned the visible band to the D1 2(2)B1-D0 1(2)B1 electronic transition. We have found, on the grounds of the vibrational analysis of the dispersed spectra, that the vibronic structure of the 2(2)B1-1(2)B1 electronic transition of the benzyl type is characterized by totally symmetric fundamental modes, 1, 8a, and 9a.
Fukushima
M
Advanced Technology Research Center, Mitsubishi Heavy Industries, LTD.,, Sachiura, Yokohama, 236, Japan
Saito
K
Obi
K