Multiphoton response of He to short laser pulses of wavelength 248 nm and intensities in the range

Abstract

The state-specific expansion approach to the solution of the time-dependent Schrödinger equation was applied to the calculation of aspects of the multiphoton response of He to short laser pulses of λ = 248 nm and I = 1014-1016 W cm-2. Ionization rates and probabilities, saturation intensity and generalized cross sections are compared with recent experimental findings by Charalambidis et al. Above-threshold ionization spectra and the corresponding photoelectron angular distributions show a minor dependence on the temporal shape of the pulse.