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Manuscript Title: The UCL distorted wave code.
Authors: W. Eissner
Program title: UCLDW
Catalogue identifier: ADJG_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 114(1998)295
Programming language: Fortran.
Computer: CRAY-j90.
Operating system: UNIX.
Peripherals: disc.
Keywords: Electron-atom collisions, Electron-ion, Collisions, Distorted wave method, Atomic physics.
Classification: 2.4.

Nature of problem:
Collision strengths for electron-impact excitation of neutral atoms and positive ions are computed in the distorted wave approximation (DW) [1]; K matrix output is readily processed by JAJOM [2], yielding collision strengths between finestructure levels.

Solution method:
Partial wave approach in LS coupling with multi-configurational single particle product functions for the target: collisional radial functions are solutions in a statistical model potential; methods introduced in the structure code SUPERSTRUCTRE [3] are extended to DW - Slater State techniques and numerical propagation.

Restrictions:
None worth mentioning before relativistic effects incidentally swamp the processes.

Unusual features:
Needs preprocessing by the UCL macro-processor (Fortran 66 code comes with the source codes).

Running time:
From a few minutes (9.92 cpu-seconds on a CRAY-j90 for the small test of a CIII 6-state target up to total L=10 at 3 collision energies) to several hours.

References:
[1] W. Eissner and M.J. Seaton: J. Phys. B 5 (1972) 2187.
[2] H.E. Saraph: Comput. Phys. Commun. 15 (1978) 247.
[3] W. Eissner, M. Jones and H. Nussbaumer: Comput. Phys. Commun. 8 (1974) 270.