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Realistic modeling of ion‐neutral collisions in quadrupole ion traps
Author(s) -
He Muyi,
Guo Dan,
Feng Yan,
Xiong Xingchuang,
Zhang Huzhong,
Fang Xiang,
Xu Wei
Publication year - 2015
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.3501
Subject(s) - collision , ion , chemistry , quadrupole , atomic physics , statistical physics , physics , computer security , organic chemistry , computer science
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 © 2015 John Wiley & Sons, Ltd.