Fiordilino E

Resonance fluorescence of an atom in a standing-wave laser field

The authors calculate the fluorescent spectrum of an atom driven by a standing-wave laser field which is exactly resonant with the atomic transition when the atom is at rest. The motion of the atom causes Doppler shifts which destroy the exact resonance and produces a spectrum which can have peaks at omega k= omega L+k.V+kL.vn where omega L is the laser frequency, kL.v is the Doppler shift and n is any integer.

Laser-modified electron scattering from a slowly ionising atom

When an electron scatters from an atom in the presence of a laser field which is resonant with an atomic transition, off-shell effects enter into the cross section. These only become significant at higher laser intensities where the atom may also be ionised by the laser. The authors obtain cross sections for electron-atom scattering in which these off-shell effects appear and in which the slow ionisation of the atom by the laser is included. These are complex results, but they suggest some experiments in which simplifications can occur and which still retain these exotic effects.