To facilitate direct spectroscopic observation of hydrogen chloride anions (HCl⁻), electron bombardment of CH₃Cl diluted in excess Ar during matrix deposition was used to generate this anion. Subsequent characterization were performed by IR spectroscopy and quantum chemical calculations. Moreover the band intensity of HCl⁻ decays slowly when the matrix sample is maintained in the dark for a prolonged time. High-level ab inito calculation suggested that HCl⁻ is only weakly bound. Atom-in-molecule charge analysis indicated that both atoms of HCl⁻ are negatively charged and the Cl atom is hypervalent.

中文翻译：

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固体氩气中氯化氢阴离子的直接红外观察

为了促进氯化氢阴离子（HCl中直接分光观察^- ），CH的电子轰击₃氯基质沉积过程中过量的Ar稀释的用于生成此阴离子。随后的表征通过红外光谱和量子化学计算进行。此外盐酸的谱带强度^-衰减时慢慢基质样品保持在黑暗中延长的时间。高级别从头算计算表明，盐酸^-仅微弱结合。原子在分子电荷分析表明，盐酸的两个原子^-是带负电荷和氯原子是高价。