EasySpin forum

This is very helpful. But how does easyspin then produce the half-field response? I would assume easyspin must transform the Hamiltonian and put it into a rotating reference frame to make an EPR signal possible. Is that true? If so, how does it eliminate the time dependence of the four terms (C,D,E,...

I am struggling to figure out how easyspin gives rise to the "forbidden" half-field transition with the introduction of a dipolar or zero-field splitting interaction between electrons. Terms A and B of the dipolar alphabet work with the rotating wave approximation and all time dependence i...