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Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Increasing Isolation Efficiency Using a Segmented Quadrupole Mass Filter Operated with Rectangular Waveforms.

Robert L Schrader1, Gordon A Anderson2, David H Russell1

  • 1Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States.

Journal of the American Society for Mass Spectrometry
|April 30, 2024
PubMed
Summary
This summary is machine-generated.

This study evaluated a segmented quadrupole mass filter for ion isolation. While achieving 100% efficiency for wide peaks, performance decreased significantly for narrower mass-to-charge ratios.

Keywords:
Brubaker prefiltersOrbitrap mass spectrometrydigital mass filterquadrupole mass spectrometry

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry

Background:

  • Quadrupole mass filters are essential for ion selection in mass spectrometry.
  • Optimizing ion isolation efficiency is critical for complex mixture analysis.

Purpose of the Study:

  • To assess the performance of a segmented quadrupole mass filter with rectangular waveforms.
  • To determine ion isolation efficiency across varying peak widths.

Main Methods:

  • A home-built quadrupole-Orbitrap platform was utilized.
  • Rectangular and capacitively coupled rectangular waveforms were applied to prefilters.
  • SIMION simulations were used for peak shape analysis.

Main Results:

  • 100% isolation efficiency was achieved for 50 m/z peak widths.
  • Efficiency dropped to ~20% for 5 m/z peak widths at 150 V0-p.
  • Peak structure was observed due to a small exit aperture and limited RF voltage refocusing.

Conclusions:

  • Segmented quadrupoles mitigate fringing field defocusing but offer limited refocusing.
  • Achievable gains in isolation efficiency are constrained by RF voltage and system design.
  • Further optimization is needed for high-resolution ion isolation in mass spectrometry.