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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.

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.