An algorithm, based on numerical description of the terms of many-bodyperturbation theory (Goldstone diagrams), is presented. The algorithm allowsthe use of the same piece of computer code to evaluate any particular diagramin any specific order of the perturbation theory or to calculate similar termsin other areas of the many-body theory, like e.g. terms in the coupled-clusterequations. The use of the algorithm is illustrated by calculating the secondand third order correlation corrections to the removal energies of electronsfrom the ground state of sodium, copper and gallium and by calculating thehyperfine structure constants of sodium in the linearized single-double coupledcluster approximation.
展开▼
