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The Hartree-Fock cluster procedure was used to obtain the associated electronic distributions for 19F* (I = 5/2, Ex = 197 KeV excited nuclear state of the 19F atom) at possible sites in crystalline Si, Ge and diamond and to calculate nuclear quadrupole coupling constants vQ and the asymmetry parameter η of the electric field gradient at the modelled sites. Lattice relaxation effects have been...