Premium
Strong many‐electron effects in photoelectron spectra
Author(s) -
Lundqvist Stig
Publication year - 2009
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560120845
Subject(s) - photoelectric effect , atomic physics , physics , electron , spectral line , auger , relaxation (psychology) , function (biology) , quantum mechanics , psychology , social psychology , evolutionary biology , biology
The spectrum of emitted photoelectrons is easiest to understand when the photoelectrons possess moderate and high energies. If one neglects the dynamical interaction of the outgoing electron with the system, the spectrum will be determined by the states of the N − 1‐particle system, i.e., the spectrum associated with the hole. This spectrum can conveniently be discussed in terms of the self‐energy and the spectral function for the hole. This approach gives a unified description of the entire spectral profile, including relaxation shifts, intensities, and positions of satellite structures as well as level widths, etc. Effects which are usually discussed in terms of configuration interaction and similar concepts, such as virtual or real Auger or Coster‐Kronig processes, appear in a natural way through the self‐energy. The dipolar matrix elements for the transition to the final state will be dependent on an amplitude function for the hole, which in general depends on the energy of the hole state. Several examples of numerical results with this theory will be discussed.