### Abstract

We present Fortran package QEDMOD for computing the model QED operator h^{QED} that can be used to account for the Lamb shift in accurate atomic-structure calculations. The package routines calculate the matrix elements of h^{QED} with the user-specified one-electron wave functions. The operator can be used to calculate Lamb shift in many-electron atomic systems with a typical accuracy of few percent, either by evaluating the matrix element of h^{QED} with the many-electron wave function, or by adding h^{QED} to the Dirac–Coulomb–Breit Hamiltonian. New version program summary Program Title: QEDMOD Program Files doi: http://dx.doi.org/10.17632/ct869v4gxn.1 Licensing provisions: Apache License 2.0. Programming language: Fortran 77. Journal reference of previous version: Computer Physics Communications 189 (2015) 175-181, http://dx.doi.org/10.1016/j.cpc.2014.12.002. Does the new version supersede the previous version?: Yes. Nature of problem: Fortran code for computation of the model QED operator that approximates the Lamb shift in many-electron atoms. Solution method: The method of solution is based on the algorithm developed in Ref. [1]. Reasons for the new version: Extension of the region of applicability; fixing of minor bugs. Summary of revisions: Region of supported nuclear charges is extended to Z∈[3,120]; a problem that appeared for the extended nuclear model for several selected values of Z is fixed. [1] V. M. Shabaev, I. I. Tupitsyn, and V. A. Yerokhin, Model operator approach to the Lamb shift calculations in relativistic many-electron atoms, Phys. Rev. A 88, 012513 (2013).

Original language | English |
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Pages (from-to) | 69-69 |

Number of pages | 1 |

Journal | Computer Physics Communications |

Volume | 223 |

DOIs | |

Publication status | Published - 1 Feb 2018 |

### Scopus subject areas

- Hardware and Architecture
- Physics and Astronomy(all)

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## Cite this

*Computer Physics Communications*,

*223*, 69-69. https://doi.org/10.1016/j.cpc.2017.10.007