Photochemical reaction and diffusion of caged calcium studied by the transient grating

A photoreaction of caged calcium was investigated by using the time-resolved transient grating method. The q2-dependent feature of the TG signal was analyzed based on a model that there are two parallel dissociation steps with different rates and Ca2+ is released promptly after the fracture of the caged compound. The diffusion coefficients of the caged compound and Ca2+ are determined.