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Updated: Jul 7, 2026

Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
Published on: January 20, 2022
Improving the efficiency of IMS-IMS by a combing technique.
Samuel I Merenbloom1, Stormy L Koeniger, Brian C Bohrer
1Department of Chemistry, Indiana University, Bloomington, Indiana 47405, USA.
A new method enhances multidimensional ion mobility spectrometry (IMS-IMS) efficiency by approximately 8-fold. This technique improves the analysis of complex mixtures by optimizing ion selection and activation in sequential drift regions.
Area of Science:
- Analytical Chemistry
- Spectrometry
- Biophysical Chemistry
Background:
- Multidimensional ion mobility spectrometry (IMS-IMS) is crucial for analyzing complex mixtures.
- Current IMS-IMS methods can be inefficient, requiring numerous datasets for comprehensive ion sampling.
Purpose of the Study:
- To develop a simple, efficient method for enhancing two-dimensional IMS-IMS measurements.
- To improve the sampling efficiency of ions within complex mixtures.
Main Methods:
- Introduction of ion packets into a first IMS drift region for mobility-based separation.
- Selection of narrow ion distributions with identical mobilities.
- Application of gentle activation conditions to induce conformational changes.
- Transmission of selected ions into a second IMS drift region for conformational separation.
- Implementation of a systematic timing sequence for multiple ion selections and activations.
Main Results:
- A novel timing sequence was developed for sequential ion selection and activation.
- The described method improved the efficiency of two-dimensional IMS-IMS measurements by approximately 8-fold.
- The method was successfully demonstrated using tryptic peptides from human hemoglobin.
Conclusions:
- The developed timing sequence offers a significant improvement in IMS-IMS efficiency.
- This method provides a more effective approach for analyzing complex ion mixtures.
- Enhanced IMS-IMS efficiency facilitates more comprehensive structural analysis of biomolecules.
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