Journal
PHYSICAL REVIEW A
Volume 80, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.80.053424
Keywords
atom-photon collisions; Compton effect; hydrogen neutral atoms; photoionisation; quantum electrodynamics; two-photon processes
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Funding
- Office of Basic Energy Sciences, Office of Science, U. S. Department of Energy [DE-AC02-06CH11357, DE-AC52-07NA27344]
- Visitor Program of the Max Planck Institute for the Physics of Complex Systems
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Two-photon above-threshold ionization processes in the x-ray regime are studied using atomic hydrogen as a model system. Within the minimal-coupling formalism of nonrelativistic quantum electrodynamics, two distinct interactions-A center dot p in second order and A(2) in first order-contribute to the two-photon absorption amplitude. The relative importance of these two interactions is assessed. It is found that above a photon energy of 6.8 keV, the contribution from A(2) to the total two-photon absorption cross section dominates. In this high-energy regime, above-threshold ionization is a nonsequential purely nondipole process. Rate equations are employed to calculate the probabilities of ionization by Compton scattering, one-photon absorption, and two-photon absorption.
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