Double ionization energies of HCl, HBr, Cl2 and Br2 molecules: An MRCI study

► Double ionization energies for HCl, HBr, Cl2 and Br2 are calculated using CASSCF/MRCI. ► Agreement with experimental data is achieved with absolute average deviations lower than 0.3 eV. ► Some double ionization energies not previously assigned are discussed.