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Manuscript Title: ION2: calculation of single ionisation total cross section using the continuum distorted-wave eikonal initial-state approximation.
Authors: D. Marshall, M. McCartney, D.S.F. Crothers
Program title: ION2A - ION2B
Catalogue identifier: ADAT_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 86(1995)279
Programming language: Fortran.
Computer: DEC VAX 9210.
Operating system: VMS V5.4, UNICOS 7.0, HP-UX 9.0, SUNOS 4.0.
Word size: 32
Keywords: Molecular physics, Scattering, Elastic, Single ionisation, Continuum distorted Wave final-state, Eikonal initial-state, Fully stripped Projectile ion, Hydrogenic target, Conservation of Probability, Impact parameter Treatment, Wave treatment.
Classification: 16.7.

Nature of problem:
ION2A/B calculates total and differential cross sections for the ionisation of hydrogen-like atoms by the impact of multiply charged fully stripped projectile ions.

Solution method:
ION2 allows the user to calculate total cross sections using the CDWEIS [1] approximation from within the wave-treatment (ION2A) and the impact parameter treatment (ION2B).

The CDWEIS approximation is a two-state perturbative approximation. Hence as the value of the charge of the projectile increases the model begins to break down, ION2B allows the user to assess the seriousness of this.

Running time:
This typically depends on input data. However to obtain an accurate total cross section (3 significant figures) on the Cray YMP8 the program ION2A takes around 8 CPU seconds and the program ION2B takes around 50 CPU seconds.

[1] D.S.F. Crothers and J.F. McCann, J.Phys.B:At.Mol.Phys. 16(1983)3229.
[2] W.H. Press, B.P. Flannery, S.A. Teukolsky and W.T. Vetterling, Numerical Recipes The Art of Scientific Computing - Fortran (1986) Cambridge.