Stevens Operators

In the single ion module so1ion the operators are identified as shown below with $I_{\alpha}$.

$$\begin{eqnarray*} X=J(J+1)\\ O_{00}&=&1\\ \hline O_{11}&=&\frac{1}{2}[J_++J_-]... ...5+J_-^5)]=I_{47} \\ O_{66}&=&\frac{1}{2}[J_+^6+J_-^6]=I_{48}\\ \end{eqnarray*}$$