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)