带正电荷的水微滴电离了周围的气体分子
Yuanyi He1, Yifan Meng1, Richard N Zare1
1Department of Chemistry, Stanford University, Stanford, California 94305, United States.
Journal of the American Society for Mass Spectrometry
|August 14, 2025
概括
通过电子喷雾电离生成的带正电荷的微滴可以电离周围的中性分子,挑战以前的假设. 这种气相电离过程,类似于负电荷滴,是由强大的电场驱动的.
科学领域:
- 分析化学 分析化学
- 物理化学 物理化学
背景情况:
- 电子喷射电离 (ESI) 使用高电压来产生带电的微滴来产生离子.
- 一个最近的说法表明,只有负电荷的微滴能电离周围的气体.
研究的目的:
- 为了研究气相电离能力的正电荷微滴在电喷射电离.
- 挑战只有负电荷的微滴才能电离中性分子的观念.
主要方法:
- 使用了脱离离子水的稳定纳米电子喷雾剂.
- 采用高分辨率质谱仪检测电离产品.
主要成果:
- 证明带正电荷的水微滴能电离氧,烯和有机蒸气等中性物种.
- 证实了来自各种中性分子在正微滴附近产生电离产物.
结论:
- 带正电荷的微滴能够诱导中性分子的气相电离.
- 这种电离过程可能涉及中性前体的电子损失,由微滴表面的强烈电场促进.
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