Beschreibung:
<jats:title>Abstract</jats:title><jats:p>A theoretical calculation of the heterodyne correlation function of scattered light is presented for a (suitably heat‐treated) NaCl crystal doped with 250 ppm divalent Sr<jats:sup>++</jats:sup> impurities. It is assumed that the impurity‐vacancy complexes (A<jats:sub>1</jats:sub>) diffuse and aggregate to form dimers (A<jats:sub>2</jats:sub>) and trimers (A<jats:sub>3</jats:sub>) by the reactions A<jats:sub>1</jats:sub> + A<jats:sub>1</jats:sub> ⇌ A<jats:sub>2</jats:sub> and A<jats:sub>2</jats:sub> + A<jats:sub>1</jats:sub> ⇌ A<jats:sub>3</jats:sub>. Light scattering arises due to fluctuations in concentrations of A<jats:sub>1</jats:sub>, A<jats:sub>2</jats:sub>, and A<jats:sub>3</jats:sub>. The correlation function, calculated under equilibrium condition, is a sum of three decaying exponentials. It reduces to 85% (of its initial value) in 10 ms at 800 K, to 30% in 10 s at 600 K, and to 6% in 10 s at 500 K, thus indicating the feasibility of the experiment at relatively high temperatures.</jats:p>