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[Licence| Download | New Version Template] adqa_v1_0.gz(4 Kbytes)
Manuscript Title: FGH, a code for the calculation of Coulomb radial wave functions from series expansions.
Authors: M.J. Seaton
Program title: FGH
Catalogue identifier: ADQA_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 146(2002)250
Programming language: Fortran.
Computer: DEC ALPHA 3000.
Operating system: UNIX.
RAM: 11M K words
Word size: 64
Keywords: Coulomb functions, Series solutions, General purpose.
Classification: 4.5.

Other versions:
Cat Id Title Reference
AAJJ_v1_0 COULAN CPC 25(1982)87

Nature of problem:
Coulomb radial functions are required in problems involving interactions between two charged particles. They depend on the scaled variables: angular momentum l; energy epsilon; radial co-ordinate r. For sufficiently small values of r they can be calculated using power-series expansions.

Solution method:
The power series can involve excessive cancellation if r is not sufficiently small. The code gives an indication of the number of decimal figures which are lost due to cancellation effects [1].

Unusual features:
A long word-length is recommended, 64 or 128 bits.

Running time:

[1] M.J. Seaton, COmput. Phys. Commun. 146 (2002) 225.