Abstract
Fast deposition of KCl vapours on a NaCl window maintained at 77 K gives highly defective films of deep violet colour. UV-visible and ESR spectra show that the colour centres are mainly represented by F and V centres formed by interaction of Schottky defects created in abnormal quantity during the deposition process at low T. The defects emerging on the surface show reactivity versus CO. In fact unusual positively and negatively charged species are formed at 77 K by CO interaction. Monomeric ( m = 1) and dimeric ( m = 2) negative species (which represent some of the initial products of the CO interaction) are readily transformed into more complex species when the CO pressure is increased.
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