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Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments

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Published on: January 20, 2022

Coulombic effects in ion mobility spectrometry.

Aleksey V Tolmachev¹, Brian H Clowers, Mikhail E Belov

¹Biological Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, USA.

Analytical Chemistry

|May 15, 2009

Summary

Coulombic effects in ion mobility spectrometry (IMS) can reduce resolving power. This study analyzes these effects, finding significant resolution loss with over 10,000 elementary charges, and discusses optimization strategies for IMS-MS.

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Area of Science:

Analytical Chemistry
Physical Chemistry

Background:

Ion mobility spectrometry coupled with mass spectrometry (IMS-MS) is a powerful analytical technique.
Improvements in IMS resolving power and sensitivity are crucial for advanced applications.
Ion traps and ion funnels enhance ion currents, improving sensitivity and throughput.

Purpose of the Study:

To analyze the impact of Coulombic effects on ion mobility spectrometry resolution.
To develop analytical relationships describing ion packet spatial evolution due to Coulombic repulsion.
To compare analytical findings with computational modeling and experimental data.

Main Methods:

Development of analytical relationships for Coulombic repulsion effects.
Computer simulation of IMS operation using a first-principles approach.
Experimental validation of theoretical and simulation results.

Main Results:

Analytical relationships were derived for ion packet spatial dispersion.
Computer modeling simulated Coulombic effects on ion transport.
Experimental results confirmed a decrease in IMS resolving power for ion populations exceeding 10,000 elementary charges.

Conclusions:

Coulombic effects significantly impact IMS resolving power at high ion populations.
Computational and experimental data align on the detrimental effects of Coulombic repulsion.
Understanding and mitigating Coulombic effects are key to optimizing IMS-MS performance.