- #1

[tex]

\hat{K_{j}}[\Psi](\textbf{x})=\Phi_{j}(\textbf{x})\int

d\textbf{x}'\frac{\Phi_{j}^{*}(\textbf{x}')\Psi(\textbf{x}')}{|\textbf{r}-\textbf{r}'|}[/tex]

Can anyone explain me why this operator is like this. I understand that it is the interaction of the j-th electron with the electrons' cloud but... how it come to be like that

thanks in advance