Many-body theory of core holes
- 1 July 1980
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 22 (1), 206-222
- https://doi.org/10.1103/physreva.22.206
Abstract
An electronic Hamiltonian appropriate for describing core-hole processes is derived and its properties are discussed. Based on this Hamiltonian a many-body theory is presented, and a useful linked-cluster theorem is proven. A distinction between relaxation and correlation terms can be made in each order of the perturbation expansion. Under certain well-defined conditions the core-ionization process can be visualized as a Franck-Condon transition between two multidimensional potential-energy surfaces in an abstract bosonic space. The corresponding approximation, the boson approximation, is discussed and applied to the water molecule.Keywords
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