The asymptotic behaviour of a system of particles with repulsion

Abstract

We use the complex-basis-function technique to calculate one-and two-photon photoionization rates in intense light sources for atomic hydrogen, the hydrogen negative ion and the hydrogen molecular ion. For H : we also calculate the-photon ionization ne. Rather than calculating the ionization rates in the perturbation approximation. we take account of svong field effects by calculaung complex quasienergies using a mixture of real and complex-basisfunctions. This allows us to extend the calculations from the penurbotive to the non-perturbative regime as the laser intensity is increased. The method works well and gives reliable estimates of these rates.