Abstract
We analyze three mechanisms of double photoionization. They are shakeoff (SO), final-state interactions (FSI) and the quasifree mechanism (QFM). We study their role in the distribution of photoelectrons and their contribution to the double-to-single cross section ratio \(R_0(\omega )=\sigma ^{++}(\omega )/\sigma ^{+}(\omega )\) in the photoionization of the K shell of the helium atom and heliumlike ions. In the latter case, we analyze the nuclear charge dependence of characteristics of the process. The QFM is at work only beyond the dipole approximation. The QFM manifested itself in experiments on the distribution in the recoil momentum at photon energies \(\omega \approx 800\) eV. It modifies the shape of the spectrum curve at the energies of several keV. We demonstrate that the approximate wave functions employed in computations of the spectrum at these energies should satisfy the second Kato cusp condition. Otherwise, they can provide a qualitatively incorrect result. At energies of several hundred keV the QFM dominates in the large part of the photoelectron’s energy distribution. It is also the main mechanism of breaking the nonrelativistic high-energy asymptotics of the ratio \(R_0(\omega )\).
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Drukarev, E.G., Mikhailov, A.I. (2016). Double Photoionization and Related Processes. In: High-Energy Atomic Physics. Springer Series on Atomic, Optical, and Plasma Physics, vol 93. Springer, Cham. https://doi.org/10.1007/978-3-319-32736-5_9
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