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,'D',[1680 110]);

in GHz is

zfield(Sy)/1e3

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

The same result is obtained by using 3 values instead of 2 in the D field.

D = 1680; E = 110;
Dvalues = [-1,-1,+2]/3*D + [+1,-1,0]*E;
Sy = struct('S',1,'g',2,'D',Dvalues);

eeint, hfine, nquad, sham, zeeman, zfsframes