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Manuscript Title: IONIS: Approximate atomic photoionization intensities
Authors: Sami Heinäsmäki
Program title: IONIS
Catalogue identifier: AEKK_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 183(2012)431
Programming language: Fortran 95.
Computer: Workstations.
Operating system: GNU/Linux, Unix.
Keywords: Photoionization, Dirac-Fock, Atoms.
Classification: 2.2, 2.5.

Nature of problem:
Photoionization intensities for atoms.

Solution method:
The code applies the output of the multiconfiguration Dirac-Fock codes Grasp92 [1] or Grasp2K [2], to compute approximate photoionization intensities. The intensity is computed within the one-electron transition approximation and by assuming that the sum of the single-particle ionization probabilities is the same for all final ionic states.

The program gives nonzero intensities for those transitions where only one electron is removed from the initial configuration(s). Shake-type many-electron transitions are not computed. The ionized shell must be closed in the initial state.

Running time:
Few seconds for a large problem with a few thousand configurations.

[1] F. A. Parpia, C. F. Fischer, I. P. Grant, Comput. Phys. Commun. 94 (1995) 249-271.
[2] P. Jönsson, X. He, C. F. Fischer, I. P. Grant, Comput. Phys. Commun. 177 (2007) 597-622.