Abstract
In the present chapter, we discuss direct photo double ionization by singlephoton absorption (Sect. 14.2) and Compton scattering (Sect. 14.3). We do not discuss the closely related phenomenon of multiple ionization by two-step processes such as photoionization followed by single- or multiple-Auger decay. We concentrate on the two most fundamental two-electron target systems: the helium atom (Sects. 14.2 and 14.3) and molecular hydrogen (deuterium) (Sect. 14.4). The subject of photo double ionization of helium is now a mature field in which an impressive experimental and theoretical breakthrough has been achieved in the previous 10 years. The theoretical progress is described in Part III of this book, we therefore restrict ourselves here to a phenomenological description and intuitive interpretation of the physical phenomena. For the problem of two-electron processes in molecules, in contrast, the major challenges for experimentalist and theoretician still lie ahead.
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Dörner, R. et al. (2003). From Atoms to Molecules. In: Ullrich, J., Shevelko, V. (eds) Many-Particle Quantum Dynamics in Atomic and Molecular Fragmentation. Springer Series on Atomic, Optical, and Plasma Physics, vol 35. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-08492-2_14
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