Journal
JOURNAL OF MODERN OPTICS
Volume 53, Issue 1-2, Pages 125-134Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500340500186099
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The quantum-orbit formalism of high-order atomic processes in a strong laser field is presented starting from the strong-field approximation generalized to include higher-order effects. It is shown how to apply the quantum-orbit theory to various processes such as high-order above-threshold ionization and detachment, high-order harmonic generation, laser-assisted X-ray-atom scattering, laser-assisted electron-ion recombination, laser-assisted electron-atom scattering and non-sequential double ionization. Particular attention is devoted to high-order above-threshold ionization by few-cycle laser pulses. The results obtained using the strong-field approximation and the theory of quantum orbits are compared with the ab initio solution of the time-dependent Schrodinger equation. It is shown that Coulomb effects are important for low-energy electron spectra.
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