Multiphoton quantum dynamics of many-electron atomic and molecular systems in intense laser fields
Li Peng-Cheng1, 2, †, Chu Shih-I3
       

(a) Resonance-enhanced structures of the HHG from He as a function of the laser intensity and the photon energy in the single atom response. (b) Same as (a) but for I = 7.0×1013 W/cm2, I = 8.0×1013 W/cm2, and I = 9.0×1013 W/cm2, respectively. The black dashed lines in (a) and (b) indicate the transition energy of the 1s2-1s2p1P (21.22 eV), and the black solid lines indicate ionization potential Ip.