Formula_8619

\[\begin{gathered}K=e^{2} \int \frac{\left|\psi_{n}\left(\boldsymbol{r}_{1}\right)\right|^{2}\left|\psi_{m}\left(\boldsymbol{r}_{2}\right)\right|^{2}}{\left|\boldsymbol{r}_{1}-\boldsymbol{r}_{2}\right|} d \tau_{1} d \tau_{2}, \\A=e^{2} \int \frac{\psi_{n}^{*}\left(\boldsymbol{r}_{1}\right) \psi_{m}\left(\boldsymbol{r}_{1}\right) \psi_{m}^{*}\left(\boldsymbol{r}_{2}\right) \psi_{n}\left(\boldsymbol{r}_{2}\right)}{\left|\boldsymbol{r}_{1}-\boldsymbol{r}_{2}\right|} d \tau_{1} d \tau_{2}\end{gathered}\]