Effect of magnetic field inhomogeneity on ion cyclotron motion coherence at high magnetic field

Gleb Vladimirov, Yury Kostyukevich, Christopher L. Hendrickson, Greg T. Blakney, Eugene Nikolaev

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    5 Citations (Scopus)


    A three-dimensional code based on the particle-in-cell algorithm modifed to account for the inhomogeneity of the magnetic feld was applied to determine the effect of Z1, Z2, Z3, Z4, X, Y, ZX, ZY, XZ2 YZ2, XY and X2-Y2 components of an orthogonal magnetic feld expansion on ion motion during detection in an FT-ICR cell. Simulations were performed for magnetic feld strengths of 4.7, 7, 14.5 and 21 Tesla, including experimentally determined magnetic feld spatial distributions for existing 4.7 T and 14.5 T magnets. The effect of magnetic feld inhomogeneity on ion cloud stabilization ("ion condensation") at high numbers of ions was investigated by direct simulations of individual ion trajectories. Z1, Z2, Z3 and Z4 components have the largest effect (especially Z1) on ion cloud stability. Higher magnetic feld strength and lower m/z demand higher relative magnetic feld homogeneity to maintain cloud coherence for a fxed time period. The dependence of mass resolving power upper limit on Z1 inhomogeneity is evaluated for different magnetic felds and m/z. The results serve to set the homogeneity requirements for various orthogonal magnetic feld components (shims) for future FT-ICR magnet design.

    Original languageEnglish
    Pages (from-to)443-449
    Number of pages7
    JournalEuropean Journal of Mass Spectrometry
    Issue number3
    Publication statusPublished - 7 Jun 2015


    • Fourier transform
    • FT-ICR
    • FTMS
    • ICR
    • Mass resolution
    • Mass resolving power
    • Penning trap


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