THE IONS PRODUCED IN HYDROGEN-CHLORIDE UPON ITS IRRADIATION BY AN ELECTRON-BEAM IN AN ARGON MATRIX AT 12-K

The radiolysis of hydrogen chloride isolated in an argon matrix at a m ole ratio Ar/HCl = 650 at 12 K was studied with an IR-spectroscopy tec hnique. New absorption bands appeared in the spectrum of the sample up on its irradiation: at 905 cm-1, assigned to the HAr(n)+ ion, and at 6 98 and 956 cm-1, characteristic of the HCl2- anion. The 905-cm-1 absor ption band disappeared under the action of IR radiation of a spectroph otometer at 12 K. The 698- and 956-cm-1 bands decreased in intensity u pon the annealing of the irradiated sample to 31.5 K and then to 35 K. Annealing of the irradiated sample led to a decrease in band intensit ies attributed to HCl monomer molecules and an increase in band intens ities attributed to HCl associates; these changes are indicative of th e diffusion of HCI molecules in the matrix at annealing temperatures. Possible mechanisms of the formation of the ions detected on irradiati on and of their decay on annealing of the sample were discussed.