Two-Stage Nonadiabatic Dynamics of Photoinduced Nucleation

Abstract

Theoretical study on the initial dynamics of photoinduced nucleation is reviewed. Employing a model of localized electrons coupled with an optical phonon mode, we numerically calculated the dynamics of photoinduced nuclei. The multifractal analysis on the geometric patterns of their boundary is suitable for understanding the dynamics of adiabatic/non-adiabatic electronic transitions during the first picoseconds after photoexcitation. We revealed that the photoinduced nucleation starts with two different processes; formation of photoinduced nuclei by rearrangement of the Franck-Condon states and their growth with coalescence of each other. This two-stage dynamics of nucleation is characteristic of the initial processes of photoinduced cooperative phenomena.