The application of low-temperature plasma ionization technology in the chemical warfare agent detection was mostly focused on the research of rapid detection methods. Limited studies are available on the ionization process of chemical warfare agents in low temperature plasma. Through the intensity of protonated molecules of dimethyl methylphosphonate (DMMP) in different solvents including methanol, deuterated methanol (methanol-D4), pure water, and deuterium oxide (water-D2), it was concluded that the water molecule in the air provides the hydrogen ion (H+) needed for ionization. The product ion spectra and the collision-induced dissociation processes of protonated molecules of nerve agent simulants, including DMMP, diethyl methanephosphonate (DEMP), trimethyl phosphate (TMP), triethyl phosphate (TEP), tripropyl phosphate (TPP), and tributyl phosphate (TBP) were analyzed. Results revealed that H+ mostly combined with phosphorus oxygen double bond (P = O) in the low-temperature plasma ionization. By analyzing the peak intensity distribution of product ions of protonated molecules, the presence of proton and charge migration in the low temperature plasma ionization and collision-induced dissociation were researched. This study could provide technical guidance for the rapid and accurate detection of chemical warfare agents through low temperature plasma ionization-mass spectrometry.

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低温等离子体电离化学战剂模拟物的电离过程

低温等离子体电离技术在化学战剂检测中的应用主要集中在快速检测方法的研究上。关于低温等离子体中化学战剂的电离过程的研究有限。通过甲醇、氘代甲醇（甲醇-D4）、纯水和氧化氘（水-D2）等不同溶剂中甲基膦酸二甲酯（DMMP）质子化分子的强度，得出结论：空气中的水分子提供了电离所需的氢离子 (H+)。DMMP、甲膦酸二乙酯（DEMP）、磷酸三甲酯（TMP）、磷酸三乙酯（TEP）、磷酸三丙酯（TPP）、和磷酸三丁酯 (TBP) 进行分析。结果表明，在低温等离子体电离中，H+主要与磷氧双键（P=O）结合。通过对质子化分子产物离子峰强度分布的分析，研究了低温等离子体电离和碰撞诱导解离过程中质子的存在和电荷迁移。该研究可为低温等离子体电离质谱法快速准确检测化学战剂提供技术指导。研究了低温等离子体电离和碰撞诱导解离中质子和电荷迁移的存在。该研究可为低温等离子体电离质谱法快速准确检测化学战剂提供技术指导。研究了低温等离子体电离和碰撞诱导解离中质子和电荷迁移的存在。该研究可为低温等离子体电离质谱法快速准确检测化学战剂提供技术指导。