Since Fujishima and Honda reported the evolution of oxygen and hydrogen from a Ti[O.sub.2] electrode under the irradiation of light in 1972 , photocatalysis is a very promising process to photodissociate
water utilizing solar energy.
Under the UV irradiation, excited singlet-state HABI derivatives will photodissociate
into two radicals because of the low C-N bond energy [2, 3].
In the fluorescence technique, a "write" laser photodissociates
the seeded or inherent molecule in the flowing medium.