PROGRAM SUMMARY
Title of program:
FGH
Catalogue identifier:
ADQA
Ref. in CPC:
146(2002)250
Distribution format: gzip file
Operating system: UNIX
High speed store required:
11M K words
Number of bits in a word:
64
Number of lines in distributed program, including test data, etc:
541
Keywords:
Coulomb functions, Series solutions, General purpose.
Programming language used: Fortran
Computer:
DEC ALPHA 3000 .
Other versions of this program:
Cat. Id. Title Ref. in CPC AAJJ COULAN 25(1982)87
Nature of physical 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.
Method of solution:
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].
Typical running time:
0.06s
Unusual features:
A long word-length is recommended, 64 or 128 bits.
References:
[1] M.J. Seaton, COmput. Phys. Commun. 146 (2002) 225.