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Manuscript Title: Research in atomic structure: a configuration interaction program with relativistic corrections.
Authors: S. Fraga, M. Klobukowski, J. Muszynska, K.M.S. Saxena, J.A. Sordo, J.D. Climenhaga, P. Clark
Program title: RIAS
Catalogue identifier: ABBB_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 47(1987)159
Programming language: Fortran.
Computer: AMDAHL 580/5860.
Operating system: MTS, NOS(VERSION 2.4.1), VSOS(VERSION 2.1.6).
RAM: 9999K words
Word size: 32
Peripherals: disc.
Keywords: Atomic physics, Structure, Energy levels, Configuration Interaction, Relativistic corrections.
Classification: 2.1.

Revision history:
Type Tit le Reference
correction 000ACORRECTION 07/09/88 See below

Nature of problem:
Determination of the energy levels of any neutral or ionized atomic system.

Solution method:
The SL, J or F levels are obtained by diagonalization of the interaction energy matrix constructed from appropriate SMS LML functions. The terms included in the Hamiltonian operator are the electronic (kinetic energy, nuclear attraction, and electrostatic repulsion) terms, the specific mass effect, the SL-non-splitting interactions (mass variation, Darwin corrections, electron spin spin contact interaction, and orbit orbit interaction), the fine-structure (electron spin orbit and spin spin dipole) interactions, and the hyperfine-structure (nuclear magnetic dipole, electric quadrupole and magnetic octupole) interactions.

Restrictions:
Calculations should be restricted to atomic systems (say, with Z<= 54) for which the perturbative Breit Pauli approach is appropriate. The physical restrictions of the program are: maximum number of orbital symmetries, 5 (s, p, d, f, g); maximum number of atomic orbitals, 20; maximum total number of radial functions, 25; maximum value of principal quantum number, 9; maximum total number of electrons in the open shells, 11; highest total orbital angular momentum quantum number, 11; maximum number of states of given symmetry (i.e., dimension of interaction energy matrix), 100.

CORRECTION SUMMARY
Manuscript Title: Research in atomic structure: a configuration interaction program with relativistic corrections. (C.P.C. 47(1987)159).
Authors: S. Fraga, M. Klobukowski, J. Muszynska, K.M.S. Saxena, J.A. Sordo, J.D. Climenhaga, P. Clark
Program title: 000ACORRECTION 07/09/88
Catalogue identifier: ABBB_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 52(1989)445
Classification: 2.1.