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Manuscript Title: A general program to calculate atomic continuum processes using the NIEM method.
Authors: R.J.W. Henry, S.P. Rountree, E.R. Smith
Program title: NIEM ASYM3
Catalogue identifier: AAJI_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 23(1981)233
Programming language: Fortran.
Computer: IBM 3033.
Operating system: JES2.
RAM: 232K words
Word size: 32
Keywords: Atomic physics, Electron atom Scattering, Electron ion scattering, Asymptotic solutions, Reactance matrices.
Classification: 2.4.

Subprograms used:
Cat Id Title Reference
AAJG_v1_0 NIEM POTC1 CPC 23(1981)233
AAJH_v1_0 NIEM NIES2 CPC 23(1981)233
ACWN_v1_0 0001 GRN2 CPC 23(1981)233

Nature of problem:
Reactance K-matrices at infinity are calculated from Wigner R-matrices or reactance K-matrices which are given at a radial boundary R1STOP, either by the user or are passed by NIEM NIES2.

Solution method:
An integral equation method is used to solve the coupled differential equations from R1STOP to a larger radial boundary R2STOP. The regular and irregular Green's function for the method are calculated by GRN2. A projection method is used to obtain the K-matrix elements at infinity from those calculated at R2STOP.

Restrictions:
Up to six scattering channels for each total angular momentum can be included. Larger calculations can be made by recompiling with larger dimensions.

Running time:
The test run took 0.80 s on the IBM 3033.