Table 4 Electric dipole selection rules in \(C_{3h}\) symmetry. \(\sigma\) represents in plane transitions while \(\pi\) represents out of plane transitions.
\(C_{3h}\) | \(A^{\prime }\) | \(A^{\prime \prime }\) | \(E_{1}^{\prime }\) | \(E_{2}^{\prime }\) | \(E_1^{\prime \prime }\) | \(E_2^{\prime \prime }\) |
|---|---|---|---|---|---|---|
\(A^{\prime }\) | Â | \(\pi\) | \(\sigma ^-\) | \(\sigma ^+\) | Â | Â |
\(A^{\prime \prime }\) | \(\pi\) | Â | Â | Â | \(\sigma ^-\) | \(\sigma ^+\) |
\(E_{1}^{\prime }\) | \(\sigma ^-\) | Â | \(\sigma ^+\) | Â | Â | \(\pi\) |
\(E_{2}^{\prime }\) | \(\sigma ^+\) | Â | Â | \(\sigma ^-\) | \(\pi\) | Â |
\(E_1^{\prime \prime }\) | Â | \(\sigma ^-\) | Â | \(\pi\) | \(\sigma ^+\) | Â |
\(E_2^{\prime \prime }\) | Â | \(\sigma ^+\) | \(\pi\) | Â | Â | \(\sigma ^-\) |
