Advanced stored waveform inverse Fourier transform technique for a matrix-assisted laser desorption/ionization quadrupole ion trap mass spectrometer

Vladimir M. Doroshenko, Robert J. Cotter

Research output: Contribution to journalArticle

Abstract

The stored waveform inverse Fourier transform (SWIFT) technique is used for broadband excitation of ions in an ion-trap mass spectrometer to perform mass-selective accumulation, isolation, and fragmentation of peptide ions formed by matrix-assisted laser desorption/ionization. Unit mass resolution is achieved for isolation of ions in the range of m/z up to 1300 using a two-step isolation technique with stretched-in-time narrow band SWIFT pulses at the second stage. The effect of 'stretched-in-time' waveforms is similar to that observed previously for mass-scan-rate reduction. The asymmetry phenomenon resulting from the stretched ion-trap electrode geometry is observed during application of normal and time-reversed waveforms and is similar to the asymmetry effects observed for forward and reverse mass scans in the resonance ejection mode. Mass-selective accumulation of ions from multiple laser shots was accomplished using a method described earlier that involves increasing the trapping voltage during ion introduction for more efficient trapping of ions.

Original languageEnglish (US)
Pages (from-to)65-73
Number of pages9
JournalRapid communications in mass spectrometry : RCM
Volume10
Issue number1
StatePublished - 1996

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Inverse transforms
Mass spectrometers
Ionization
Desorption
Fourier transforms
Ions
Lasers
Peptides
Electrodes
Geometry
Electric potential

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

Cite this

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