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Combining Enhanced Resolving Power with Duty Cycle Improvements on a Multi-Reflecting Time-of-Flight Mass

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This study enhances multireflecting time-of-flight mass spectrometry (TOF-MS) for higher resolving power and duty cycle. The new method improves ion path length and accumulation, enabling precise analyte identification and clearer imaging.

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Spectroscopy

Background:

  • Multireflecting time-of-flight mass spectrometry (TOF-MS) is crucial for detailed chemical analysis.
  • Enhancing resolving power and duty cycle in TOF-MS is essential for improved sensitivity and identification accuracy.

Purpose of the Study:

  • To describe a novel approach for increasing resolving power and duty cycle in multireflecting TOF-MS.
  • To demonstrate the utility of this technique for metabolite identification and mass spectrometry imaging.

Main Methods:

  • Extended ion path length to over 200 m using up to N=5 passes within the analyzer via a pulsed deflection electrode.
  • Implemented ion accumulation prior to orthogonal acceleration to improve duty cycle for targeted m/z ranges.
  • Acquired data at fast scan rates (10-30 Hz) and demonstrated ppb mass measurement accuracy.

Main Results:

  • Achieved resolving power increases from 220,000 to 402,000 (fwhm) at m/z 785.
  • Demonstrated signal improvements of 2 orders of magnitude for targeted ions.
  • Successfully identified fine isotope structure in a metabolite identification experiment and improved clarity in DESI mass spectrometry imaging data.

Conclusions:

  • The described method significantly enhances resolving power and duty cycle in multireflecting TOF-MS.
  • This technique provides high confidence in analyte identification through high resolution and accurate mass measurements.
  • The approach is particularly suitable for targeted high-resolution analysis and advanced applications like mass spectrometry imaging.