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Natoli, C.R.; Benfatto, M.
Istituto Nazionale di Fisica Nucleare, Rome (Italy)1988
Istituto Nazionale di Fisica Nucleare, Rome (Italy)1988
AbstractAbstract
[en] We outline a many-body description of the photoemission and photoabsorption processes that incorporates the multichannel treatment of the atomic dynamical excitations into the framework of the multiple scattering theory. In this way the interplay between excitation dynamics and electronic and geometrical structure of the ground state is elucidated. At the same time this approach provides a theoretical model for the study of the evolution from the adiabetic to the sudden regime. We derive a new multiple scattering expansion that takes into account interchannel transitions as well. As an application we discuss the homogeneous and inhomogeneous mixed-valent compounds, where the theory provides a clue at resolution of the ''threshold puzzle'' and sheds light onto the relation between photoemission and photoabsorption spectroscopy
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1988; 20 p; Core level spectroscopy in condensed systems; Osaka (Japan); 19-24 Oct 1987
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