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Updated: Sep 18, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Treating Spin-Orbit Coupling and Spin-Spin Coupling in the Framework of the Iterative Configuration Expansion
Lucas Lang1, Vijay Gopal Chilkuri1, Frank Neese1
1Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany.
None:
Spin-adapted configuration state functions (CSFs) provide a compact many-electron basis for open-shell molecules. This basis is employed in one flavor of the recently introduced iterative configuration expansion (ICE) selected CI method. In this work, we implemented spin-dependent operators like spin-orbit coupling and direct spin-spin coupling for use in quasidegenerate perturbation theory on top of nonrelativistic/scalar-relativistic ICE wave functions. At the core of the new implementation are matrix elements of spin tensor excitation operators between CSFs, which are evaluated as products of orbital-specific factors. Two applications, the electron paramagnetic resonance g-factors of a MoIII-based catalytic intermediate and the zero-field splitting in dioxygen, illustrate the capabilities of the new method.
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