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Many performance parameters of Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry improve dramatically with increasing magnetic field. Our prior results from a 20 tesla resistive magnet showed that performance was limited by the large spatial inhomogeneity in spite of the high field. In this paper, we compare matrix-assisted laser desorption/ionization (MALDI) mass spectra at the same magnetic field for two resistive magnets with different field spatial homogeneity. In addition, we report MALDI spectra at 25 tesla—the highest magnetic field for FT-ICR to date. The first broadband FT-ICR mass spectrum [poly(ethylene glycol) 2000] from a resistive magnet is accurately fitted by the standard ICR mass calibration function.
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Shi et al. (1999) studied this question.
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