High-Order Harmonic Generation in the Ionization Process
CHEN Jing1, CHEN Shi-Gang2, LIU Jie2
1Institute of Theoretical Physics, Chinese Academy of Science, Beijing 100080
21nstitute of Applied Physics and Computational Mathematics, P.O.Box 8009, Beijing 100088
High-Order Harmonic Generation in the Ionization Process
CHEN Jing1;CHEN Shi-Gang2;LIU Jie2
1Institute of Theoretical Physics, Chinese Academy of Science, Beijing 100080
21nstitute of Applied Physics and Computational Mathematics, P.O.Box 8009, Beijing 100088
Abstract： Based on the nonperturbative quantum electrodynamics scattering theory for multiphoton ionization developed recently, high-order harmonic generated in the ionization process is discussed. The influence of the Coulomb potential is treated as a perturbation in the expansion of the transition matrix. It is deduced that the harmonic photons are emitted in the resonant process during ionization and the width of the harmonic peaks is just the ionization rate of the atom.
2000, Vol. 17 
