Abstract
A universal method of finding the expressions for non‐relativistic and relativistic matrix elements of any one‐ and two‐electron operators for an arbitrary number of shells in an atomic configuration, requiring neither coefficients of fractional parentage nor unit tensors, is discussed. It is based on the second quantization method in the coupled tensorial form, angular momentum theory in three spaces (orbital, spin and quasispin) and generalized graphical technique. The method is implemented in a number of computer codes and has already demonstrated its high efficiency for generating various atomic data of high precision.
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