Accuracy of the Faddeev Random Phase Approximation for Light Atoms
Abstract
The accuracy of the Faddeev random phase approximation (FRPA) method is tested by calculating the total and ionization energies of a set of light atoms up to Ar. Comparisons are made with the results of coupled-cluster singles and doubles (CCSD), third-order algebraic diagrammatic construction [ADC(3)], and with the experiment. It is seen that even for two-electron systems, He and Be-2+, the inclusion of RPA effects leads to satisfactory results and therefore it does not over-correlate the ground state. The FRPA becomes progressively better for larger atomic numbers where it gives about 5 mH more correlation energy and it shifts ionization potentials by 2-10 mH, with respect to its sister method ADC(3). The corrections for ionization potentials consistently reduce the discrepancies with the experiment.
Keywords
Cite
@article{arxiv.1004.2607,
title = {Accuracy of the Faddeev Random Phase Approximation for Light Atoms},
author = {C. Barbieri and D. Van Neck and M. Degroote},
journal= {arXiv preprint arXiv:1004.2607},
year = {2015}
}
Comments
10 pages, 3 figures, 4 tables