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Manuscript Title: LSGEN: a program to generate configuration-state lists of LS-coupled basis functions.
Authors: L. Sturesson, C.F. Fischer
Program title: MCHF_LSGEN
Catalogue identifier: ACLG_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 74(1993)432
Programming language: Fortran.
Computer: VAXstation 3100.
Operating system: VMS, ULTRIX, Sun UNIX.
Word size: 32
Peripherals: disc.
Keywords: Atomic physics, Structure, Configuration Interaction, Configuration states, Complex atoms, Correlation, Functions wave, Bound states, Ls coupling.
Classification: 2.1.

Nature of problem:
Atomic properties are calculated to high accuracy using large, systematic expansions of basis configuration state functions in variational MCHF calculations.

Solution method:
By a systematic mutli-replacement of electrons in subshells, up to principal quantum number 15 and orbital angular momentum "n", all possible configurations and couplings are generated. The program generates a configuration state list in the "clist" format required by the MCHF atomic stucture package (C.F. Fischer, Comp. Phys. Commun. 64(1991)369. The reference configurations and active set are entered simultaneously.

Restrictions:
The number of subshells in a configuration may be selected to be any number between 1 and 5 (five) but there is no further restriction on the number of electrons. Due to the limitations in the MCHF package f- subshells may be populated with 0,1,2 or 14 electrons, while g-subshells and others with higher orbital angular momentum may only be populated with 0,1 or 2 electrons. Fully populated f-subshells are automatically transferred to the list of closed subshells, common to all configuration states.

Running time:
The CPU time required for the test runs is 0.6 seconds and 3.0 seconds for Test Run 1 and 2, respectively, on a DECstation 3100.