论文部分内容阅读
High order harmonic generation(HHG)is an important nonlinear effect when atoms and molecules are irradiated by intense laser fields.They can be used to synthesize ultrashort pulses that allow one to observe the electronic processes in attosecond timescales.Meanwhile,the generated harmonics bring a large amount of the information of the atomic and molecular orbitals(MOs),and thus can be used to extract the information of these quantum states.