Electronic zero-field interaction Hamiltonian.

F = zfield(SpinSystem)

This function computes the Hamiltonian of all electronic zero-field interactions in the spin system described by the structure SpinSystem. For formulas see internal.

The zero-field term of a simple spin system

Sy = struct('S',1,'g',[2 2 2],'D',[-450 -670 1120]);

in GHz is

zfield(Sy)/1e3

ans =
    0.5600         0    0.1100
         0   -1.1200         0
    0.1100         0    0.5600

eeint, hfine, internal, nquad, sham, zeeman