Double poles of the S-matrix in laser-assisted electron-atom scattering
Physique Théorique, Faculté des Sciences,
Université Libre de Bruxelles,
CP 227, B-1050 Bruxelles, Belgium
Accepted: 31 October 1996
We discuss two double-resonance scenarios within the context of laser-assisted electron-atom scattering in which double poles of the S-matrix occur. We demonstrate the effect of the double poles on the resonant contribution to the cross-section as well as on the time delay matrix and we point out that double poles could be observed experimentally at quite modest intensities and at frequencies corresponding to existing lasers.
PACS: 03.65.Nk – Nonrelativistic scattering theory / 33.40.+f – Multiple resonances (including double and higher-order resonance processes, such as double nuclear magnetic resonance, electron double resonance, and microwave optical double resonance) / 34.80.Qb – Laser-modified scattering
© EDP Sciences, 1996