EPR spectra are commonly discussed in terms of the parameters that occur in the spin-Hamiltonian, a Hamiltonian operator that incorporates various effects involving spatial operators (like the orbital angular momentum) into operators that depend on the spin alone. Show that, if you use H = -ge Ye Bo sz - Ye' Bo lz as the true Hamiltonian, then from second-order perturbation theory (and specifically eqn 9.65), the eigen values of the spin are the same as those of the spin-Hamiltonian H spin = -gYe'130sz (note the g in place of gel and find an expression for g.