THRESHOLD BEHAVIOR OF NEUTRAL PHOTODISSOCIATION WITH EXCITATION OF COPROBED BY DISPERSED FRAGMENT VUV FLUORESCENCE

Dispersed VUV fluorescence emitted from photodissociation fragments in the wavelength range between 90 and 200 nm has been recorded followin g the neutral photodissociation of CO using monochromatized synchrotro n radiation for exciting-photon energies close to the respective disso ciation thresholds. Qualitatively different energy dependencies of the fluorescence intensities have been observed close to the thresholds. Atomic carbon fluorescence at wavelengths of 119, 128, 132.9, and 146 nm has been observed for the first time after neutral photodissociatio n with excitation of CO.