This self-contained textual content introduces readers to the sector of high-energy atomic physics - a brand new regime of photon-atom interactions within which the photon energies considerably exceed the atomic or molecular binding energies, and which spread out with the new creation of latest synchrotron sources.
From a theoretical standpoint, a small-parameter attribute of the sure process emerged, making it attainable to accomplish analytic perturbative calculations which may in flip function benchmarks for extra strong numerical computations. the 1st a part of the booklet introduces readers to the principles of this new regime and its theoretical remedy. specifically, the validity of the small-parameter perturbation enlargement and of the lowest-order approximation is significantly reviewed. the next chapters then follow those insights to varied atomic methods, akin to photoionization as a many-body challenge, dominant mechanisms for the creation of ions at larger energies, Compton scattering and ionization followed through construction of e-e+ pairs, and the photoionization of endohedral atoms (e.g. fullerene). final yet no longer least, the computationally difficult transitions within the electron shell in the course of particular types of nuclear decays are investigated in detail.
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