Separation and identification of dominant mechanisms in double photoionization

Details Separation and identification of dominant mechanisms in double photoionization Separation and identification of dominant mechanisms in double photoionization

2002-05-08

arxiv.org/abs/physics/0205017v1

Phys. Rev. Lett. 89, 073002 (2002)

Physics

Atomic Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.89.073002

Double photoionization by a single photon is often discussed in terms of two contributing mechanisms, {\it knock-out} (two-step-one) and {\it shake-off} with the latter being a pure quantum effect. It is shown that a quasi-classical description of knock-out and a simple quantum calculation of shake-off provides a clear separation of the mechanisms and facilitates their calculation considerably. The relevance of each mechanism at different photon energies is quantified for helium. Photoionization ratios, integral and singly differential cross sections obtained by us are in excellent agreement with benchmark experimental data and recent theoretical results.

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