A recent S -matrix-based QED calculation of energy levels of the lithium isoelectronic sequence is extended to the general case of a valence electron outside an arbitrary filled core. Emphasis is placed on modifications of the lithiumlike formulas required because more than one core state is present, and an unusual feature of the two-photon exchange contribution involving autoionizing states is discussed. Here, the method is illustrated with a calculation of the energy levels of sodiumlike ions, with results for 3s1/2, 3p1/2, and 3p3/2 energies tabulated for the range Z = 30 – 100 . Comparison with experiment and other calculations is given, and prospects for extension of the method to ions with more complex electronic structure discussed.
Sapirstein, J. and Cheng, K. T.. "<math><mi>S</mi></math> -matrix calculations of energy levels of sodiumlike ions." Physical Review A - Atomic, Molecular, and Optical Physics, vol. 91, no. 6, Jun. 2015. https://doi.org/10.1103/PhysRevA.91.062508
Sapirstein, J., & Cheng, K. T. (2015). <math><mi>S</mi></math> -matrix calculations of energy levels of sodiumlike ions. Physical Review A - Atomic, Molecular, and Optical Physics, 91(6). https://doi.org/10.1103/PhysRevA.91.062508
Sapirstein, J., and Cheng, K. T., "<math><mi>S</mi></math> -matrix calculations of energy levels of sodiumlike ions," Physical Review A - Atomic, Molecular, and Optical Physics 91, no. 6 (2015), https://doi.org/10.1103/PhysRevA.91.062508
@article{osti_1234599,
author = {Sapirstein, J. and Cheng, K. T.},
title = {<math><mi>S</mi></math> -matrix calculations of energy levels of sodiumlike ions},
annote = {A recent S -matrix-based QED calculation of energy levels of the lithium isoelectronic sequence is extended to the general case of a valence electron outside an arbitrary filled core. Emphasis is placed on modifications of the lithiumlike formulas required because more than one core state is present, and an unusual feature of the two-photon exchange contribution involving autoionizing states is discussed. Here, the method is illustrated with a calculation of the energy levels of sodiumlike ions, with results for 3s1/2, 3p1/2, and 3p3/2 energies tabulated for the range Z = 30 – 100 . Comparison with experiment and other calculations is given, and prospects for extension of the method to ions with more complex electronic structure discussed.},
doi = {10.1103/PhysRevA.91.062508},
url = {https://www.osti.gov/biblio/1234599},
journal = {Physical Review A - Atomic, Molecular, and Optical Physics},
issn = {ISSN PLRAAN},
number = {6},
volume = {91},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2015},
month = {06}}
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, Vol. 208, Issue 1095, p. 552-559https://doi.org/10.1098/rspa.1951.0181