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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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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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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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Accessing Higher Order Mathieu Space Stability Zones to Narrow Isolation Widths Using Digital Quadrupole

Elizabeth Groetsema1, Adam P Huntley1, Shane Tichy2

  • 1Department of Chemistry, Washington State University, Pullman, Washington 99164, United States.

Journal of the American Society for Mass Spectrometry
|December 20, 2025
PubMed
Summary
This summary is machine-generated.

Digital quadrupoles in higher-order Mathieu space zones (HZs) offer enhanced mass spectrometry resolution and narrower isolation windows. This advancement minimizes chimeric interferences in complex mixtures, improving MS/MS data quality without deconvolution software.

Keywords:
chimeric spectradigital quadrupole mass filterquadrupole mass spectrometrytandem mass spectrometry

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Area of Science:

  • Mass Spectrometry
  • Analytical Chemistry
  • Instrumentation

Background:

  • Conventional quadrupole operation in mass spectrometry has limitations in resolving power.
  • Higher-order Mathieu space stability zones (HZs) offer potential for improved performance.
  • Digital quadrupoles driven by rectangular RF waveforms enable access to these HZs.

Purpose of the Study:

  • To investigate the performance of digital quadrupoles operating in HZs within a quadrupole time-of-flight (Q-TOF) instrument.
  • To demonstrate the capability of HZs to achieve narrower isolation windows for improved analyte selectivity.
  • To assess the impact of HZ operation on MS/MS data quality, particularly concerning chimeric interferences.

Main Methods:

  • Modification of a commercial Q-TOF instrument with a low-voltage digital waveform driver.
  • Operation of the filtering quadrupole in digital mode within HZs (zones (3,1) and (3,2)).
  • Analysis of analyte mixtures to evaluate isolation window width and MS/MS data quality.

Main Results:

  • Digital quadrupoles in HZs achieved significantly narrowed isolation windows for analytes up to 1543 m/z.
  • Experimental data suggest performance extends to approximately 900 m/z in zone (3,1) and 2500 m/z in zone (3,2).
  • MS/MS analysis of a mixture yielded data with minimal chimeric nature, even without deconvolution software.

Conclusions:

  • Digital quadrupoles operating in HZs provide enhanced selectivity and reduced chimeric interferences in mass spectrometry.
  • The ability to access HZs with low voltages and achieve narrow isolation windows is beneficial for tandem mass spectrometry.
  • Hybrid systems combining sine and digital quadrupole operation offer a versatile approach to maximize analytical performance.