Hydrogen Dichloride Radical: Infrared Detection through the Matrix Isolation Technique

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Abstract
When hydrogen chloride–chlorine–argon mixtures are passed through a glow discharge and the products are condensed at 14°K, two conspicuous infrared absorptions at 956 and 696 cm−1 result. Concentration dependence of intensities, isotopic labeling, and force-field calculations lead to assignment of these bands to hydrogen dichloride. The force field calculated supports a linear, centrosymmetric (D∞h) structure with hydrogen bond strength apparently comparable to or exceeding those attributed to HCl2− in various crystals.