Role of elastic scattering in high-order above threshold ionization
Chen Zhang-Jin†, Ye Jian-Mian, Xu Yang-Bing
       
Comparison of the angle-integrated photoelectron energy spectra of the QRS model including the focal volume averaging and the experimental measurements of Paulus et al .[ 28 ] for single ionization of Ar in a 40-fs pulse with a wavelength of 630 nm. The long curves represent the experimental data and the short ones starting from 4 U p denote the QRS simulations. The curves are separated in the vertical direction for visual convenience. From top to bottom, the laser peak intensities estimated in Ref. [ 28 ] for experimental measurements are 4.4×1014 W/cm2, 2.4×1014 W/cm2, 1.2×1014 W/cm2, and 0.6×1014 W/cm2, while the corresponding peak intensities used in the simulations are 2.9×1014 W/cm2, 1.7×1014 W/cm2, 1.1×1014 W/cm2, and 0.6×1014 W/cm2, respectively. The QRS results are normalized to the experimental data individually at high energies to obtain the best fit.