Low-energy structure in the ionization of argon: Comparison of experiment with theory

Abstract

The above-threshold ionization of argon in an intense 70-fs, 400-nm linearly polarized laser pulse has been investigated by the velocity map imaging techniques, combined with an attosecond-resolution quantum wave packet dynamics method. There is a quantitative agreement in all dominant features between the experiment and the theory. Moreover, a peak-splitting phenomenon in the first energy peak has been observed at high pulse intensity. Further, through the theoretical analysis, an ac Stark splitting with evident resonant and nonresonant ionization pathways has been found to be the physical reason for the experimental observations.

Laser control on molecular harmonic emission and isolated attosecond pulse generation

“…, HeH 2+ , H 2 , HeH + etc) attracts lots of attention in optical physics [1,2] and leads to many new interesting phenomena. Such as, the bond softening and hardening [3,4]; the asymmetric ionization and dissociation channels [5,6]; the charge-resonance-enhanced-ionization [7,8]; the dissociative ionization [9], the kinetic-energy spectra of the dissociation and the Coulomb explosion channels [10]; the above-threshold dissociation (ATD) and the above-threshold ionization (ATI) [11,12]; the molecular high-order harmonic generation (MHHG) [13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”