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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
Published on: August 17, 2017
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Nonlinear resonance effects during ion storage in a quadrupole ion trap
D M Eades1, J V Johnson, R A Yost
1Department of Chemistry, University of Florida, 32611, Gainesville, FL, USA.
Journal of the American Society for Mass Spectrometry
|November 15, 2013
Summary
Higher-order fields cause nonlinear resonances in quadrupole ion traps, leading to increased ion amplitudes and potential ejection. This impacts experiments like chemical ionization and collision-induced dissociation (CID).
Area of Science:
- Analytical Chemistry
- Physical Chemistry
- Mass Spectrometry
Background:
- Quadrupole ion traps utilize electric fields to store and manipulate ions.
- Higher-order fields, beyond the ideal quadrupole, can introduce complex behaviors.
- Nonlinear resonances can affect ion stability and experimental outcomes.
Purpose of the Study:
- To investigate the impact of higher-order fields on ion behavior in quadrupole ion traps.
- To identify the conditions under which nonlinear resonances occur and their consequences.
- To understand how instrumental parameters influence these nonlinear resonance effects.
Main Methods:
- Theoretical analysis of ion motion under combined fields.
- Experimental observation of ion behavior in a quadrupole ion trap.
- Systematic variation of instrumental parameters (radiofrequency/direct current voltages, ion population, storage time).
Main Results:
- Higher-order field contributions lead to nonlinear resonances.
- These resonances cause increased axial and radial ion amplitudes.
- Ion ejection and collision-induced dissociation (CID) can be triggered by these effects.
Conclusions:
- Nonlinear resonances driven by higher-order fields are a significant factor in quadrupole ion trap experiments.
- Experimental conditions such as long storage times and high ion populations increase susceptibility.
- Understanding these effects is crucial for optimizing ion trap performance and data interpretation.
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