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首页> 外文期刊>Journal of mass spectrometry: JMS >Realistic modeling of ion-neutral collisions in quadrupole ion traps
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Realistic modeling of ion-neutral collisions in quadrupole ion traps

机译：四极离子阱中离子中性碰撞的真实模型

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摘要

In this study, three ion-neutral collision models have been discussed and compared, including the Langevin, the hard-sphere and the mixed collision models. With the pseudo-potential approximation, analytical expressions of ion secular motions with the hard-sphere and mixed collision models have been obtained for the first time. Through numerical simulations and theoretical calculations, it is found that the mixed collision model could be used as a general description of ion-neutral collisions under different conditions. Langevin collision model is a good description of low energy collisions between small ions and neutrals, while hard-sphere collision model could be used to describe high energy collisions and/or ions with higher masses (larger physical sizes). These analytical expressions of ion motion decay profiles enable the creation of direct relationships between time-domain image currents with ion collision cross sections. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：在这项研究中，已经讨论并比较了三种离子中性碰撞模型，包括兰格文，硬球和混合碰撞模型。利用伪势近似，首次获得了具有硬球和混合碰撞模型的离子长期运动的解析表达式。通过数值模拟和理论计算，发现混合碰撞模型可以作为不同条件下离子中性碰撞的一般描述。 Langevin碰撞模型很好地描述了小离子与中性离子之间的低能碰撞，而硬球碰撞模型可用于描述高能碰撞和/或质量较高（物理尺寸较大）的离子。离子运动衰减曲线的这些解析表达式使得能够在具有离子碰撞截面的时域图像电流之间建立直接关系。版权所有（c）2015 John Wiley＆Sons，Ltd.

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