We continue here cur study [10-13] of the thermodynamic limit for various m
odels of Quantum Chemistry, this time focusing on the Hartree-Fock type mod
els. For the reduced Hartree-Fock models, we prove the existence of the the
rmodynamic limit for the energy per unit volume. We also define a periodic
problem associated to the Hartree-Fock model, and prove that it is well-pos
ed. (C) 2001 editions scientifiques et medicales Elsevier SAS.