Atomic Transitions in Ultra Strong Laser Fields.

摘要

Calculations were made of the ionization rate of hydrogen by an intense electromagnetic field in the dipole approximation and in an approximation in which this field dominates the electron-proton interaction in intermediate states. It was found that the transition rate behaves as E(-1) for l1nEarly polarized fields and E(-2) InE for circularly polarized fields where E is the amplitude of the electric field. We have also calculated the transition rate for excitation of the 2s state and Raman photon. The result behaves as (E(-2)W) for small W where W is the energy of the Raman photon. An estimation shows that the method is a good one for electric field strengths of the order of 2 x 10 to the 11th power V/cm or higher. This is larger than available currently.