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Manuscript Title: An improved version of ISICS: a program for calculating K-, L- and M-shell cross sections from PWBA and ECPSSR theory using a personal computer.
Authors: Sam J. Cipolla
Program title: ISICS
Catalogue identifier: ADDS_v3_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 179(2008)616
Programming language: C++.
Computer: 80486 or higher-level PCs.
Operating system: WINDOWS 98 through WINDOWS XP.
Keywords: Atomic K-, L-, M-Shell ionization, PWBA and ECPSSR cross sections, Ion-Atom collisions, C++ package, Gauss-Legendre quadrature integration techniques.
PACS: 34.50.Fa, 31.15.-p.
Classification: 16.7.

Does the new version supersede the previous version?: Yes

Nature of problem:
Ionization and x-ray production cross section calculations for ion-atom collisions.

Solution method:
Numerical integration of form factor using a logarithmic transform and Gaussian quadrature, plus exact integration limits.

Reasons for new version:
The formatting of the M-shell atomic parameters involving cross section calculations for Uranium and heavier elements needed to be corrected.

Summary of revisions:
The affected file XCSC.H in ISICS has been corrected and ISICS has been recompiled.

Restrictions:
The consumed CPU time increases with the atomic shell (K,L,M), but execution is still very fast.

Running time:
This depends on which shell and the number of different energies to be used in the calculation. For example, to calculate K-shell cross sections for protons striking carbon for 19 different proton energies it took less than 10 s; to calculate M-shell cross sections for protons on gold for 21 proton energies it took 4.2 min.