Comment on "A comparison of relativistic and quasirelativistic line strengths" by A. K. Mohanty and D. H. Sampson

Abstract

The relation between Dirac and quasirelativistic methods of calculation of line strengths in hydrogen-like atoms and the problem of finding the optimum quasirelativistic approach, discussed recently by Mohanty and Sampson [Physica Scripta 35, 645 (1987)], is clarified. We demonstrate that an approach based on an improved quasirelativistic theory of atoms gives in the hydrogen-like case exactly the same results as the Dirac equation and therefore is the optimum one in the sense of the Mohanty and Sampson criterion.