Single ionization of Ne by intense laser fields

A three-dimensional classical Monte Carlo method has been used to examine t he final state electron dynamics after single ionization of neon in an elec tric field generated by a short-pulse high-intensity laser. Linearly and ci rcularly polarized fields were studied. Intensities ranging from 3 x 10(14) to 3 x 10(15) W cm(-2) were used with a wavelength of 800 nm and a full-wi dth at half-maximum of 30 fs. At these values, the Keldysh parameter is les s than one, making the classical approximation valid. A potential determine d by Hartree-Fock calculations has been used to model the Ne atom. A kinema tically complete picture of the final state momenta of Ne+ and the ionized electron is generated by the calculation. Differential cross sections were found to be similar at electron energies < 2U(P) over a wide range of inten sities, but to vary greatly at higher electron energies, demonstrating the held intensity dependence of rescattering of the electron by the Ne+ ion. C omparisons have been made with experimental data and quantum mechanical the ory.