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Ion-Ion Interactions in Charge Detection Mass Spectrometry.
Journal of the American Society for Mass Spectrometry ( IF 3.2 ) Pub Date : 2019-11-01 , DOI: 10.1007/s13361-019-02343-y
Daniel Y Botamanenko 1 , Martin F Jarrold 1
Affiliation  

Charge detection mass spectrometry (CDMS) is a single-particle technique where the masses of individual ions are determined by simultaneously measuring their mass-to-charge ratio (m/z) and charge. Ions are usually trapped inside an electrostatic linear ion trap (ELIT) where they oscillate back and forth through a detection cylinder, generating a periodic signal that is analyzed by fast Fourier transforms. The oscillation frequency is related to the ion's m/z, and the magnitude is related to the ion's charge. In early work, multiple ion trapping events were discarded because there was a question about whether ion-ion interactions affected the results. Here, we report trajectory calculations performed to assess the influence of ion-ion interactions when multiple highly charged ions are simultaneously trapped in an ELIT. Ion-ion interactions cause trajectory and energy fluctuations that lead to variations in the oscillation frequencies that in turn degrade the precision and accuracy of the m/z measurements. The peak shapes acquire substantial high and low m/z tails, and the average m/z shifts to a higher value as the number of trapped ions increases. The effects of the ion-ion interactions are proportional to the product of the charges and the square root of the number of trapped ions and depend on the ions' m/z distribution. For the ELIT design examined here, ion-ion interactions limit the m/z resolving power to several hundred for a typical homogeneous ion population.

中文翻译:

电荷检测质谱中的离子-离子相互作用。

电荷检测质谱 (CDMS) 是一种单粒子技术,通过同时测量它们的质荷比 (m/z) 和电荷来确定单个离子的质量。离子通常被困在静电线性离子阱 (ELIT) 内,在那里它们通过检测圆柱体来回振荡,产生一个由快速傅立叶变换分析的周期性信号。振荡频率与离子的 m/z 有关,幅度与离子的电荷有关。在早期的工作中,由于存在离子-离子相互作用是否会影响结果的问题,所以放弃了多次离子捕获事件。在这里,我们报告了当多个高电荷离子同时被困在 ELIT 中时,为评估离子-离子相互作用的影响而执行的轨迹计算。离子-离子相互作用会导致轨迹和能量波动,从而导致振荡频率发生变化,进而降低 m/z 测量的精度和准确度。峰形获得大量的高和低 m/z 拖尾,平均 m/z 随着捕获离子数量的增加而移动到更高的值。离子-离子相互作用的影响与电荷的乘积和俘获离子数量的平方根成正比,并取决于离子的 m/z 分布。对于此处检查的 ELIT 设计,离子-离子相互作用将典型的均质离子群的 m/z 分辨率限制为数百。峰形获得大量的高和低 m/z 拖尾,平均 m/z 随着捕获离子数量的增加而移动到更高的值。离子-离子相互作用的影响与电荷的乘积和俘获离子数量的平方根成正比,并取决于离子的 m/z 分布。对于此处检查的 ELIT 设计,离子-离子相互作用将典型的均质离子群的 m/z 分辨率限制为数百。峰形获得大量的高和低 m/z 拖尾,平均 m/z 随着捕获离子数量的增加而移至更高的值。离子-离子相互作用的影响与电荷的乘积和俘获离子数量的平方根成正比,并取决于离子的 m/z 分布。对于此处检查的 ELIT 设计,离子-离子相互作用将典型的均质离子群的 m/z 分辨率限制为数百。
更新日期:2020-04-22
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