Beschreibung:
<jats:title>Abstract</jats:title><jats:p>The ESR spectrum of AgBr:Se crystals which have been irradiated at 120 °K with green light is changed by heating the crystals to 170 °K. The spectrum obtained after heating was recently investigated and attributed to a Se<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/tex2gif-stack-3.gif" xlink:title="urn:x-wiley:03701972:media:PSSB19670240222:tex2gif-stack-3" /> centre. In the present paper the spectrum observed before heating is analyzed with regard to <jats:italic>g</jats:italic>‐values, and superhyperfine and hyperfine structure. This spectrum is also found to be due to a Se<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/tex2gif-stack-4.gif" xlink:title="urn:x-wiley:03701972:media:PSSB19670240222:tex2gif-stack-4" /> centre of ortho‐ rhombic symmetry The two centres differ in their surroundings and a model of this situation is developed. The investigations are extended to AgCl:Se.</jats:p>