Chlorine is one of the highly mobile elements that participated in early aqueous chemistry and later alteration in Mars history. Our new experimental results suggest that chlorine could cycle on present‐day Mars between the atmosphere and surface, driven by multiphase redox plasma chemistry induced by current Martian dust activity (dust storms, dust devils, and grain saltation). We present two sets of experimental results that demonstrate the instantaneous release of chlorine from seven common chlorides during a medium strength electrostatic discharge (ESD) process that induced plasma chemistry in a Mars environmental chamber. Results include (1) the direct detection of a plasma emission line at 837.8 nm of the first excited state of the Cl atom (Cl‐I ) by in situ plasma spectroscopy during the ESD process for MgCl₂, FeCl₂, and AlCl₃ and (2) the characterization of Cl‐bearing phases in the films deposited on the upper electrode after 7 hr of ESD exposure on each of seven chlorides (NaCl, KCl, CaCl₂, MgCl₂, FeCl₂, AlCl₃, and FeCl₃), using Raman spectroscopy, X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy‐dispersive X‐ray (EDX) spectroscopy, and X‐ray photoelectron spectroscopy (XPS). This study is part of a series of laboratory investigations on the Martian atmosphere and surface interaction induced by electrochemistry.

中文翻译：

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火星尘埃活动从普通氯化物中释放出氯

氯是流动性强的元素之一，参与了早期的水化学反应和后来的火星变化。我们的新实验结果表明，在当前火星尘埃活动（沙尘暴，尘埃魔鬼和谷物盐分化）引起的多相氧化还原等离子体化学作用下，氯可能会在当今的火星上在大气与地面之间循环。我们提供了两组实验结果，这些结果证明了在中等强度静电放电（ESD）过程中从七种常见氯化物中瞬时释放氯，该过程​​在火星环境室内引发了等离子体化学反应。结果包括（1 ）通过原位直接检测Cl原子（Cl‐I）的第一激发态在837.8 nm处的等离子体发射线在MgCl ₂，FeCl ₂和AlCl ₃的ESD过程中的等离子体光谱和（2）在七个氯离子（NaCl，KCl ，CaCl ₂，MgCl ₂，FeCl ₂，AlCl ₃和FeCl ₃），使用拉曼光谱，X射线衍射（XRD），扫描电子显微镜（SEM），能量色散X射线（EDX）光谱和X射线光电子能谱（XPS）。这项研究是火星大气和电化学引发的表面相互作用的一系列实验室研究的一部分。