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Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
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Published on: January 20, 2022

High-pressure ion mobility spectrometry.

Eric J Davis1, Prabha Dwivedi, Maggie Tam

  • 1Washington State University, Department of Chemistry, P.O. Box 644630, Pullman, Washington 99164, USA.

Analytical Chemistry
|March 28, 2009
PubMed
Summary
This summary is machine-generated.

Investigating above-ambient pressure in ion mobility spectrometry (IMS) improved the separation of compounds. Higher pressures enhanced resolution, though optimal resolving power was limited by ion clustering.

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Area of Science:

  • Analytical Chemistry
  • Spectrometry
  • Physical Chemistry

Background:

  • Ion mobility spectrometry (IMS) is a powerful analytical technique for separating and identifying ions.
  • Standard IMS typically operates at or below ambient pressure, limiting its resolving capabilities in certain applications.
  • Exploring superambient pressures in IMS could potentially enhance performance metrics like resolution and sensitivity.

Purpose of the Study:

  • To investigate the effects of above-ambient pressure on ion mobility spectrometry performance.
  • To evaluate the impact of superambient pressures on resolving power, resolution, and ion current.
  • To demonstrate the feasibility of operating an ion mobility spectrometer at pressures exceeding ambient conditions.

Main Methods:

  • Utilized a small, stand-alone ion mobility spectrometer (IMS) capable of operating at pressures from 700 to 4560 Torr.
  • Acquired ion mobility spectra for dimethyl methylphosphonate (DMMP), a chemical warfare agent stimulant, and other standard compounds.
  • Analyzed the relationship between pressure, voltage, resolving power, resolution, and total ion current.

Main Results:

  • Demonstrated the first instance of ion mobility spectrometry conducted at pressures above ambient.
  • Observed that increased pressure generally improved the resolution of closely related compounds, such as cyclohexylamine and 2-hexanone.
  • Found that total ion current initially increased with pressure, reaching a maximum at a specific superambient pressure.

Conclusions:

  • Operating ion mobility spectrometry at above-ambient pressures offers significant advantages for improving analyte separation and resolution.
  • While ion clustering can limit theoretical resolving power gains at very high pressures, practical resolution benefits are evident.
  • This study establishes a foundation for developing advanced IMS techniques utilizing superambient pressure conditions for enhanced analytical performance.