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NEIL J. REILLY, DAMIAN L. KOKKIN, SCOTT H. KABLE AND TIMOTHY W. SCHMIDT, School of Chemistry, University of Sydney, NSW 2006, Australia.
We have applied the tools of laser induced fluorescence and dispersed fluorescence to the products of a benzene discharge in a free jet with a view to identifying new hydrocarbon radicals. We have observed several new band systems in the visible and UV regions, including a putative origin at 4759Å (air) which fluoresces to a ground state exhibiting vibrational modes at 120 cm-1, 821 cm-1, 988 cm-1 and 1160 cm-1. This species is of particular interest due to its proximity to the centre of the (very) diffuse interstellar band at 4761.7Å (FWHM 25Å).