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Updated: Jan 26, 2026
08:40
Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
Published on: January 20, 2022
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Principles of Ion Selection, Alignment, and Focusing in Tandem Ion Mobility Implemented Using Structures for Lossless
Rachel M Eaton1, Samuel J Allen1, Matthew F Bush2
1Department of Chemistry, University of Washington, Box 351700, Seattle, WA, 98195-1700, USA.
Journal of the American Society for Mass Spectrometry
|April 10, 2019
Summary
Tandem ion mobility (IM) experiments reveal that trapping ions between separation dimensions improves analysis. This selection-trapping method offers advantages over traditional selection-only methods for ion characterization.
Area of Science:
- Analytical Chemistry
- Physical Chemistry
Background:
- Tandem ion mobility (IM) separates ion subpopulations.
- Current methods often transfer ions directly between separation dimensions.
- Structures for Lossless Ion Manipulations (SLIM) enable novel IM operation modes.
Purpose of the Study:
- To characterize selection, trapping, and separation processes in tandem IM.
- To compare selection-trapping experiments with selection-only experiments.
- To investigate ion behavior within SLIM-based tandem IM.
Main Methods:
- Experimental analysis of tandem ion mobility.
- Computational trajectory simulations.
- Utilizing SLIM architecture for ion manipulation.
Main Results:
- Ion temporal profiles can deviate from selection waveform widths by up to ±500 μs.
- Selection-trapping focuses ions between dimensions, mitigating prior broadening.
- Ion thermalization during focusing establishes consistent initial conditions for subsequent separation.
Conclusions:
- Selection-trapping experiments demonstrate significant advantages over selection-only experiments in tandem IM.
- Ion focusing and thermalization in selection-trapping enhance subsequent separation.
- This study provides foundational understanding for advanced multi-dimensional IM analyses.
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