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High-Resolution Differential Ion Mobility Separations/Orbitrap Mass Spectrometry without Buffer Gas Limitations.

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Differential ion mobility spectrometry coupled with mass spectrometry (FAIMS/MS) can now be optimized using helium or hydrogen gas. Hardware modifications improve vacuum stability, enhancing isomer and isobar separation capabilities.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Differential ion mobility spectrometry (FAIMS) and mass spectrometry (MS) offer powerful isomer and isobar separation.
  • High resolution in both FAIMS and MS dimensions is crucial for maximizing analytical performance.
  • Orbitrap mass analyzers provide high mass resolution and accuracy.
  • FAIMS resolution is often enhanced using helium (He) or hydrogen (H2) as carrier gases, which can elevate ion mobility.

Purpose of the Study:

  • To address the challenge of maintaining ultrahigh vacuum (UHV) in Orbitrap MS when using He or H2 in FAIMS.
  • To enable independent optimization of FAIMS carrier gas composition without compromising MS performance.
  • To enhance the overall utility and flexibility of hybrid FAIMS/MS platforms.

Main Methods:

  • Implementation of a differential pumping stage between the FAIMS and MS interfaces.
  • Reconfiguration of vacuum lines to isolate the high vacuum (HV) pumping region.
  • Evaluation of vacuum stability and MS performance under different FAIMS carrier gas conditions.

Main Results:

  • Hardware modifications significantly reduced pressure increases caused by He or H2 aspiration from the FAIMS stage.
  • The differential pumping step and isolated vacuum line reconfiguration effectively ameliorated vacuum complications.
  • Free optimization of FAIMS carrier gas composition became feasible without negatively impacting Orbitrap MS performance.

Conclusions:

  • The developed hardware modifications overcome the limitations of using light carrier gases in FAIMS/MS systems.
  • This advancement allows for maximizing FAIMS resolution through carrier gas choice, leading to improved isomer and isobar separation.
  • The enhanced FAIMS/MS platforms offer greater utility and flexibility for complex mixture analysis.