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Manuscript Title: A general program to calculate atomic continuum processes using the R- matrix method.
Authors: K.A. Berrington, P.G. Burke, J.J. Chang, A.T. Chivers, W.D. Robb, K.T. Taylor
Catalogue identifier: AAHE_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 8(1974)149
Programming language: Fortran.
Computer: ICL 1906A.
Operating system: GEORGE 4.
RAM: 24K words
Word size: 24
Keywords: Atomic physics, Wave function, Continuum, Bound, Bessel functions, Yukawa, Static, Square well, De vogelaere, R-matrix, Eigenfunction.
Classification: 2.7.

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Nature of problem:
This is a new version of the program by Robb. The program has been changed to conform with ASA Fortran and to become a compatible unit with the atomic scattering packages being run on the Atlas Computer Laboratory ICL 1906A and the Rutherford Laboratory IBM 370/195. The changes are as follows: (i) Replacement of several non-standard FORTRAN statements. (ii) Reordering of the variables in the COMMON blocks containing both real and integer variables so that the program can be run in single or double precision on the IBM 370/195. The real variables preceed the integer variables. (iii) Replacement of all real constants that occur in the program with real variables. The latter are initialized in data statements. This facilitates the conversion from single precision to double precision. (iv) The subroutine MA01A has been replaced by a fully comented and improved version. (v) Some additional tests for zero are inserted to prevent overflow.