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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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Improved Miniaturized Linear Ion Trap Mass Spectrometer Using Lithographically Patterned Plates and Tapered Ejection

Yuan Tian1, Trevor K Decker2, Joshua S McClellan2

  • 1Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA.

Journal of the American Society for Mass Spectrometry
|August 25, 2017
PubMed
Summary
This summary is machine-generated.

A novel two-plate linear ion trap mass spectrometer enhances performance and miniaturization. Its tapered ejection slits improve ion management and enable smaller, more robust designs for field applications.

Keywords:
Linear ion trap (LIT)MicrofabricationMiniaturizationPlate spacingResolutionScan rate

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry Instrumentation

Background:

  • Previous linear ion trap mass spectrometer designs faced limitations in performance and miniaturization.
  • Issues such as charge build-up and ion blocking at ejection slits hindered optimal performance.

Purpose of the Study:

  • To develop a new two-plate linear ion trap mass spectrometer addressing prior design challenges.
  • To enhance both the performance and miniaturization capabilities of ion trap mass spectrometers.

Main Methods:

  • Utilized borosilicate glass substrates with patterned aluminum electrodes and wire-bonded printed circuit boards.
  • Incorporated tapered ejection slits to mitigate charge build-up and ion trajectory issues.
  • Optimized plate spacing using a motorized translation stage for operational adjustments.

Main Results:

  • Achieved a scan rate of 2300 Th/s for a mixture of toluene, deuterated toluene (D8), and xylenes.
  • Demonstrated narrowest peak widths of 0.33 Th (Full Width at Half Maximum - FWHM).
  • The tapered slit design facilitated miniaturization of trap features while maintaining substrate ruggedness.

Conclusions:

  • The new two-plate linear ion trap design successfully overcomes performance and miniaturization limitations.
  • The tapered ejection slits are crucial for improved ion handling and enable robust, compact mass spectrometer development.
  • This advancement supports the creation of smaller, field-deployable mass spectrometry instruments.