Journal
PHYSICAL REVIEW A
Volume 69, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.69.032703
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We investigate the double K-shell ionization of heliumlike ions caused by the absorption of a single photon with energies being much smaller than the rest energy of an electron. In the near-threshold region, differential and total cross sections of the process are calculated for light ions, taking into account the leading orders of the 1/Z and alphaZ expansions. QED perturbation theory with respect to the parameter 1/Z exhibits a fast convergence in the entire nonrelativistic domain for moderate nuclear charge numbers Zgreater than or equal to2. Going beyond the electric dipole approximation leads to a forward/backward asymmetry in the angular distributions for the ejected electrons with respect to the incident photon beam. A comparison of theoretical predictions for the ratio of double-to-single photoionization cross sections with available experimental data for a number of neutral atoms is also presented.
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