It was shown that as a result of absorption of light quant adatom, which was on the surface of ion-covalent crystal, could acquire energy, larger in magnitude than the energy of diffusion activation. The estimations of an increasing rate of diffusion migration of adatoms.

Photostimulated Diffusion of Adatoms on Ion-Covalent Crystal Surfaces. A.B.Darinskii: Bulletin of the Russian Academy of Sciences - Physics, 2011, 75[10], 1357-60