As of 1 April 2026, the PSJD database will become an archive and will no longer accept new data. Current publications from Polish scientific journals are available through the Library of Science: https://bibliotekanauki.pl
Detailed photo-ESR study of iron and chromium impurities in ZnSe is presented. The energy level position of Fe 2+/3+ energy level is determined. The role of iron and chromium impurities in nonradiative recombination processes is discussed.