engleski

Double ionization of a Helium-like atom or ion by a high energy photon

A review recent progress in claculations of the ratio of double to single photoionization of Helium-like atoms and ions at high energies. Whether relativistic effects are important is discussed, with particular emphasis on recent relativistic calculations of double ionization of Helium-like atoms and ions by Compton scattering. These calculations, based on sudden approximation or impulse approximation, show that, for low Z elements, relativistic effects do not alter the high energy limit of the Compton double to single ratio R_C, even though they do affect single and double ionization Compton scattering separately.

double ionization; Compton scattering

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