Research Papers in Physics and Astronomy


Date of this Version

July 1988


Published by American Physical Society. Phys. Rev. Lett. 61, 404 (1988). Copyright © 1988 American Physical Society. Permission to use.


Well-known variational principles for second-order perturbation matrix elements are extended to higher-order multiphoton processes for atomic hydrogen. Numerical applications to two- and three-photon ionization of the hydrogen ground state provide results comparable to those of analytic calculations, even near intermedaite-state resonances, yet without the complications involved in summation over intermediate states. Extensions to multiphoton processes for many-electron atoms are discussed briefly.

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