Role of elastic scattering in high-order above threshold ionization
Chen Zhang-Jin†, Ye Jian-Mian, Xu Yang-Bing
       
Comparison of angle-integrated photoelectron energy spectra of the QRS model, calculated with the full potential of He+ and the pure Coulomb potential only including the focal volume averaging, and the experimental measurements and the semiclassical simulations of Sheehy et al .[ 27 ] for single ionization of He in a 120-fs pulse with a wavelength of 780 nm at peak intensities of (a) 8.0×1014 W/cm2 and (b) 10.0×1014 W/cm2. The QRS results are shown for energies above 3 U p–4 U p. The QRS spectra calculated with the full potential of He+ and the pure Coulomb potential only are relative and normalized to the experimental data at high energies with the same factor. See text.