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The coupling effects of hexapole and octopole fields in quadrupole ion traps: a theoretical study
Author(s) -
Wang Yuzhuo,
Huang Zejian,
Jiang You,
Xiong Xingchuang,
Deng Yulin,
Fang Xiang,
Xu Wei
Publication year - 2013
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.3239
Subject(s) - chemistry , quadrupole , quadrupole ion trap , ion , ion trap , atomic physics , center of mass (relativistic) , displacement (psychology) , field (mathematics) , analytical chemistry (journal) , physics , classical mechanics , psychology , mathematics , organic chemistry , energy–momentum relation , chromatography , pure mathematics , psychotherapist
A theoretical method, the harmonic balance method, was introduced to study the coupling effects of hexapole and octopole fields on ion motion in a quadrupole ion trap. Ion motion characteristics, such as ion motion center displacement, ion secular frequency shift, nonlinear resonance curve and buffer gas damping effects, have been studied with the presence of both hexapole and octopole fields. It is found that hexapole fields have bigger impacts on ion motion center displacement, while octopole fields dominate ion secular frequency shift. Furthermore, the nonlinear features originated from hexapole and octopole fields could enhance or cancel each other, which provide us more space in a practical ion trap design process. As an example, an ion trap with improved performance was designed using a specific combination of hexapole and octopole fields. In this ion trap, a hexapole field was used to achieve efficient ion directional ejection, while an octopole field was added to correct the chemical mass shift and resolution degradation introduced by the hexapole field. Copyright © 2013 John Wiley & Sons, Ltd.