Abstract:A number of ideas and methods for theoretical studies of the structure and spectra of manyelectron systems are considered. The main emphasis is on the self-consistent ® eld method in various approximations: single-and multi-con® guration approaches, analytical and numerical radial wavefunctions, and general methods of calculation of spin-angular parts of various matrix elements. The importance is stressed of the use of the second quantization and quasispin technique in coupled tensorial form.
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