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Spatial Separation of Molecular Conformers and Clusters
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A mini mass spectrometer with a low noise Faraday detector.

Yang Tang1, Qian Xu, Dayu Li

  • 1School of Life Science, Beijing Institute of Technology, Beijing 100081, China. weixu@bit.edu.cn.

The Analyst
|April 17, 2020
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Summary

A novel low noise Faraday detector was developed for miniature mass spectrometers, enabling operation at higher pressures. This advancement facilitates the miniaturization of ion trap mass spectrometers and improves detection limits.

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Area of Science:

  • Analytical Chemistry
  • Instrument Development
  • Mass Spectrometry

Background:

  • Conventional ion trap mass spectrometers use electron multipliers, limiting operation to pressures below 20 mTorr.
  • High vacuum requirements hinder the miniaturization of ion trap mass spectrometers.

Purpose of the Study:

  • To develop and integrate a low noise Faraday detector into a miniature mass spectrometer.
  • To improve the performance of miniature mass spectrometers by enabling higher operating pressures.

Main Methods:

  • Development of a low noise Faraday detector.
  • Integration of the detector into a miniature mass spectrometer instrument.
  • Application of post-data processing techniques to enhance performance.

Main Results:

  • Achieved a limit of detection of 1 ng mL⁻¹.
  • Characterized quantitation performance and mass resolution.
  • Demonstrated feasibility of operating at increased background pressures.

Conclusions:

  • The developed low noise Faraday detector supports the miniaturization of ion trap mass spectrometers.
  • This technology allows for higher background pressures, overcoming limitations of electron multipliers.