Experimental positron lifetime data for three vacancy-related defects in synthetic type Ib diamonds with well known structures were uniquely suitable for comparison with theoretical investigations of lattice relaxation. Lattice Relaxation at V−, NV−, and NVN− Defects in Diamond Investigated by Positron Annihilation. S.Dannefaer: Journal of Physics - Condensed Matter, 2009, 21[17], 175412