The perturbative theory of laser induced collisional charge exchange (LICCE) is presented, in which the laser induced collisional charge exchange is described as a four body system and the compound atomic and ionic states are used as basis states of LICCE, and the equation of motion for the probability amplitudes of the states are obtained.

The process of laser induced collision energy transfer(LICET) with two dipole-dipole interactions is analyzed by the theory of four quasimolecular level model with two intermediate states.

In this paper a four level model of laser induced collisional energy transfer (LICET) is presented in which the effects of the two intermediate states are considered.

Photon absorption of conduction band electronsand impact ionization under irradiation of few-cycle ultrashort laser pulses;

A quantitative model based on impact ionization is presented.

This paper investigates the relationship between the impact ionization and temperature in ultra high-speed InP-based SHBTs.

It is concluded that the surface charge characteristic under nanosecond pulse is influenced by the charge injection,the secondary electron emission and the collision ionization and so on.