## coulomb integral, $$H_{\text{rr}}$$

https://doi.org/10.1351/goldbook.C01366
Integral over space of the type $$\int \psi _{r}\ast \ \hat{H}\ \psi _{r}\ \text{d}\tau$$ where $$\hat{H}$$ is the hamiltonian operator containing electrostatic potential energy terms and $$\psi$$ is a one-electron wavefunction.
Source:
Green Book,2nd ed., p. 17 (https://www.cintegrado.com.br/site/documentos/green_book_2ed.pdf)