Single ionization ofNe by intense laser fields

Abstract

A three-dimensional classical Monte Carlo method has been used toexamine the final state electron dynamics after single ionization of neonin an electric field generated by a short-pulse high-intensity laser.Linearly and circularly polarized fields were studied. Intensities rangingfrom 3×1014 to 3×1015 W cm-2 wereused with a wavelength of 800 nm and a full-widthat half-maximum of30 fs. At these values, the Keldysh parameter is less than one, making theclassical approximation valid. A potential determined by Hartree-Fockcalculations has been used to model the Ne atom. A kinematicallycomplete picture of the final state momenta of Ne+ and the ionizedelectron is generated by the calculation. Differential cross sections werefound to be similar at electron energies < 2Up over a wide range ofintensities, butto vary greatly at higher electron energies, demonstrating thefield intensity dependence of rescattering of the electron by the Ne+ion. Comparisons have been made with experimental data and quantummechanical theory.