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Manuscript Title: A nonrelativistic program for optical response in atoms using a time- dependent local density approximation.
Authors: A. Zangwill, D.A. Liberman
Program title: GOLIATH
Catalogue identifier: AAML_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 32(1984)63
Programming language: Fortran.
Computer: CRAY 1.
Operating system: CTSS, LTSS.
RAM: 168K words
Word size: 64
Keywords: Atomic physics, Structure, Self-consistent field Scf, Local density Approximation :lda>, Photoabsorption, Polarizability, Random phase Approximation :rpa>, Time dependent local Density approximation Tdlda, Linear response.
Classification: 2.1.

Nature of problem:
The program does SCF calculations for atoms and ions in stationary states. It also calculates the response of an atom or ion to a weak external oscillating field taking account of the most important collective effects. The main output includes static and dynamic polarizabilities and photoabsorption and partial photoemission cross sections.

Solution method:
Differential equations are solved by standard numerical methods. Self- consistency is obtained by iteration using appropriate relaxation methods.

With small or slow computers, high Z atoms may not be possible. Open- shell atoms use an average-over-configuration approximation that may reduce the ultility of the calculations.

Unusual features:
A considerable variety of options are available that make the program a flexible tool for the user.

Running time:
On the CRAY 1 computer, a few seconds for the initial state SCF calculation and less than a second for each frequency in the TDLDA calculation.