Fluorescence as a probe of energy dependence of electron-molecule interaction

The fluorescence intensity dependences on electron kinetic energy, or fluor escence excitation functions, for some aromatic (perylene and p-terphenyl) and heterocyclic (biphenylfuran, oxazoles, and oxadiazoles) compounds are s tudied. It is found that the addition of phenyl rings to the above molecule s result in a moderate decrease in excitation function. On the other hand, introducing heteroatoms such as oxygen or nitrogen leads to a substantial d ecrease in excitation function.