ABSTRACT
Photochemical reactions occur when a gas, a solution, or a solid mixture of chemicals absorbs light to produce an excited state, which further reacts generating different reaction products. Part of the excited-state particles might not convert into new species, but rather revert to the ground-state species. The research field of heterogeneous photochemistry is focused toward the investigation of each of the above-mentioned steps and elucidation of their mechanism and kinetics.
