Three-Step Model for High-Harmonic Generation in Many-Electron Systems
ORAL
Abstract
The three-step model (TSM) of high-harmonic generation (HHG) is generalized to atomic and molecular many-electron systems. Using many-body perturbation theory, corrections to the standard TSM due to exchange and electron--electron correlations are derived. It is shown that canonical Hartree-Fock orbitals represent the most appropriate set of one-electron states for calculating the HHG spectrum. To zeroth order in many-body perturbation theory, a HHG experiment allows direct access in general to a combination of occupied Hartree-Fock orbitals rather than to the highest occupied molecular orbital by itself.
*This work was supported in part by the Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy, under Contract No. W-31-109-ENG-38. Partial support by AFOSR under grant FA9550-04-1-0011 is gratefully acknowledged.
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