Intense-Field Many-Body S-Matrix Theory (IMST)
The IMST provides a systematic ab-initio approach to investigate the dynamics of atoms and molecules interacting with intense laser radiation. Structurally, the usual S-matrix expansions, as the time-dependent perturbation theory, are based on a single partition of the total Hamiltonian of the system into an unperturbed reference Hamiltonian and the interaction potential. Such an 'one-potential' scheme is not very useful for the analysis of strong-field processes, in which the internal Coulomb interaction between the charged particles in the atom or molecule and the external laser-electron interaction energy are of comparable strength. Thus, one requires to be able to account simultaneously of different reference Hamiltonians in the initial, intermediate and final states. The IMST is such a more general S-matrix expansion scheme. It provides an effective method for analyses of direct and rearrangement processes that can occur in the presence of intense laser fields.
Review: A. Becker and F.H.M. Faisal, J. Phys. B 38 (2005) R1
Collaboration: F.H.M. Faisal (Bielefeld University, Germany)
