I. Rabadan et al., ON THE VALIDITY OF THE SOFT-PHOTON APPROXIMATION FOR ELECTRON-ATOM COLLISIONS IN THE PRESENCE OF A LASER FIELD, Journal of physics. B, Atomic molecular and optical physics, 27(16), 1994, pp. 120000535-120000541
The validity of the Kroll-Watson approximation to treat electron-atom
collisions in the presence of a laser field is discussed. Numerical ca
lculations have been carried out using classical mechanics and a model
potential to describe electron-helium scattering for conditions of ex
perimental interest. The effect of an additional polarization term, ar
ising from the interaction between the laser field and that due to the
electron, is shown to be negligible.