Abstract
During a study of luminescence induced by low energy (20 keV) light ion (H+, He+) impact on certain alkali halides (LiCl, NaBr, NaCl, KBr, KCl) we have observed a band spectrum in the region 230 to 350 nm. The bands are separated by 0.26 eV and have a half-width of 0.12 eV; no fine structure is observed. Identical bands of much increased intensity are observed when samples deliberately doped with CN− are bombarded. The phenomenon is not found with KBr crystals. We suggest that the observed bands are due to transitions in the CN radical, possibly the D 2Π1–X 2Σ+ transition that is observed as a very weak transition in discharges. The mechanism whereby CN is formed on the samples remains unclear.
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