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Manuscript Title: Electron impact excitation cross sections.
Authors: M.R.C. McDowell, L. Morgan, V.P. Myerscough
Program title: POLORB
Catalogue identifier: AAGW_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 7(1974)38
Programming language: Fortran.
Computer: CDC 7600.
Operating system: SCOPE, MAXIMOP.
RAM: 31K words
Word size: 60
Keywords: Atomic physics, Scattering, Electron, Hydrogen-like ion, Distorted wave, Coulomb born, Born oppenheimer, Excitation, S-states, Numerov.
Classification: 2.4.

Nature of problem:
Determines total and differential cross sections for the electron impact induced 1s - ns transitions in hydrogrnic systems in a number of approximations.

Solution method:
A partial wave expansion is used. The radial scattering functions are obtained by a non-iterative method and normalized by matching to a JWKB solution.

Only 1s-> ns transitions are treated and without modification to COEFFS, n<=5. An extension to 1s-> np transitions is in preparation.

Running time:
DWPO calculations take up to 60 s CPU time on a CDC 6600, depending on the number of partial waves required for convergence. Born, Born- Oppenheimer, CB1 and CBO1 calculations require less than 5 s per case.