Abstract
The authors present calculations using a variational method for the time-dependent Schrodinger equation for the study of multiphoton ionization of H atoms in intense laser fields. The trial wavefunction is chosen to be an anisotropic Gaussian wavepacket and the case of linear polarization of the laser field is considered. They report on ionization rates as a function of laser intensity (in the range 1015-1016 W cm2) and frequency (corresponding to ionization by three or more photons) and momentum-dependent electron spectra. Comparison is made with results obtained when the trial wavefunction is an isotropic Gaussian wavepacket and with large-scale numerical calculations. The present method gives reliable results for nonresonant ionization in the limit of high field intensity as well as in the low-frequency limit. The electron momentum distributions are singly peaked and provide a qualitative picture of the ionization process at high field strengths.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call