Diffusion of Cl₂ Molecules in NaCl and RbCl Crystals Doped with OH⁻ Ions

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Diffusion measurements have been made for Cl₂ in NaCl and RbCl crystals doped with OH⁻ ions. Diffusion front was detected by observing the blue coloration with electron irradiation or the yellow fluorescence due to O₂⁻ ions. The solution of the diffusion equation with a chemical reaction permits the evaluations of diffusion coefficient and Henry’s constant of Cl₂ in these crystals. Activation energies of the diffusion are 1.61±0.11 eV with D₀=5.8×10⁻⁵ m² s⁻¹ in NaCl and 1.84±0.24 eV with D₀=7.1×10⁻² m² s⁻¹ in RbCl. These results are compared with theoretical results by Diller. Temperature dependence of the Henry’s constant indicates that dissolution of Cl₂ molecules at the surface is the exothermic reaction.