澄清水微滴质谱中m/ z36离子的同一性。

IF 2.7 2区化学 Q3 CHEMISTRY, PHYSICAL

The Journal of Physical Chemistry A Pub Date : 2025-05-22 Epub Date: 2025-05-13 DOI:10.1021/acs.jpca.5c02557

Xiaowei Song, Lecheng Lyu, Jinheng Xu, Dong Xing, Xinxing Zhang, Richard N Zare

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引用次数: 0

摘要

提出了几条证据线，当超纯水喷射到空气中并对所产生的水微滴进行质量分析时，在m/z 36处出现一个峰，该峰被确定为水二聚体阳离子。水二聚体阳离子（H2O）2+•和水合铵离子（NH4+·H2O）在低分辨率质谱中具有本质上难以区分的质量差异。通过比较（H2O）2+•和NH4+·H2O的行为随温度和盐浓度的变化，可以排除超纯水喷洒到实验室空气中形成NH4+·H2O的可能性。

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Clarifying the Identity of the m/z 36 Ion in Water Microdroplet Mass Spectra.

Several lines of evidence are presented that when ultrapure water is sprayed into air and the resulting water microdroplets are mass analyzed a peak at m/z 36 appears, which is identified as the water dimer cation. The water dimer cation, (H₂O)₂^+•, and the hydrated ammonium cation, NH₄⁺·H₂O, have essentially indistinguishable mass differences in a low-resolution mass spectrum. By comparing the behavior of (H₂O)₂^+• and NH₄⁺·H₂O with temperature and salt concentration, we can rule out the formation of NH₄⁺·H₂O in the spraying of ultrapure water into laboratory air.

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来源期刊

The Journal of Physical Chemistry A 化学-物理：原子、分子和化学物理

CiteScore

5.20

自引率

10.30%

发文量

922

审稿时长

1.3 months

期刊介绍： The Journal of Physical Chemistry A is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.