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Manuscript Title: A program for computing weak and intermediate field Zeeman splittings from MCHF wave functions.
Authors: P. Jonsson, S. Gustafsson
Program title: ZEEMAN
Catalogue identifier: ADPN_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 144(2002)188
Programming language: Fortran, Matlab.
Computer: IBM-compatible PC.
Peripherals: disc.
Keywords: Lande g factor, Zeeman effect, Magnetic field, Multiconfiguration Hartree-Fock+Breit-Pauli, Intermediate coupling, Atomic physics, Structure.
Classification: 2.1.

Nature of problem:
Prediction of Zeeman splittings using Breit-Pauli wave functions.

Solution method:
The electronic wave function for a state labeled gammaJM can be expanded in terms of LSJ coupled configuration state functions Psi(gammaJM) = Sigmai(ci Phi(gammaiLiSiJM)). The Lande g factor can then generally be calculated by summing the g factors between configuration state functions weighted by the product of the expansion coefficients. Using the Lande g factors the total interaction matrix is constructed. By diagonalizing the interaction matrix for different values of the magnetic field the positions of the magnetic sublevels are obtained.

Restrictions:
The complexity of the cases that can be handled is entirely determined by the MCHF atomic structure package [1] used for the generation of the electronic wave functions.

References:
[1] C. Froese Fischer, Computer Phys. Commun. 64 (1991), 369.