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The structure of V, and D, centres in KBr and KBr:Sr crystals X-rayed at 80 K is studied by optical methods. The molecular ion Br; situated in two anion and one cation lattice sites is shown to be the basic entity of the structure of these centres. The creation mechanism of such Br; centres via interaction of H centres is discussed. It is ~sumed that the interaction of two H centres leads to the local reconstruction of the lattice. The occurrence of one particular process of this kind resulting in a new anion Frenkel pair near a cation vacancy is demonstrated.KBr:Sr, 0 6 n y s e n~~x pemreHoBcKHMH nyqa~u n p~ 80 K. no~caaa~o, ¶TO OCHOBOP

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