simion modeling


Also, the inductive detector cannot be saturated in the same manner as a microchannel plate detector. The fidelity of the simulation was shown to be sensitive to the spatial resolution of the model when predicting the dependence of trapping efficiency on qz. None of the above excitation waveforms changes the initial spatial distribution of the ion packet: in particular, off-resonance single-frequency excitation results in oscillatory variation in ICR orbital radius, but does not induce any net spatial synchronization in the ion packet. Charge reversal was activated by irradiating precursor ions with high energy electrons or UV photons: the first reported use of those activation methods for charge reversal. Appearance of the sidebands there is detrimental for the analytical performance, especially in case of complex mixtures analyzed at high resolution.
All rights reserved. Multiplexing of the O-traps can further increase the analysis speed. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. SIMION modeling of ion image charge detection in Fourier transform ion cyclotron resonance mass spectrometry.

(d) External ion accumulation allows efficient coupling of atmospheric pressure continuous ionization sources (notably electrospray ionization) with pulsed high-vacuum FT-ICR MS excitation/detection, and injection of externally trapped ions through the “magnetic mirror” into the ICR ion trap has been optimized based on ion trajectory simulations.

If the ions are generated at a localized point in time and space, and the data is simultaneously acquired with multiple pickup rings, the method is shown to be a significant improvement on Fourier analysis. Further progress in the theory of the ICR signal shall outline the way for further improvements in FT-ICR MS performance. Mass-selective external ion accumulation is essential for the structural characterization of these low-abundance (modified) peptides. The field correction leads to a definite performance increase in terms of resolving power and mass accuracy, and the mass spectrum contains intensity-minimized even-numbered harmonics. ++m Dynamic ion trapping in a cylindrical open cell for Fourier transform ion cyclotron resonance mass s... Tandem Mass Spectrometry in Quadrupole Ion Trap and Ion Cyclotron Resonance Mass Spectrometers, Self-correlation method for processing random phase signals in Fourier Transform Mass Spectrometry. It is shown that the kinetic energy of ions can be determined by the shape of this signal. The phenomenon of ion cyclotron resonance allows for determining mass-to-charge ratio, m/z, of an ensemble of ions by means of measurements of their cyclotron frequency, ωc. The amplitude—phase equations show that the z-node coupling coefficients are proportional to (mass)− while the radial modes are mass-independent in the low mass limit. The model is general and could be applied to other mass analyzers including the quadrupole ion trap, time-of-flight, and orbitrap. Here, we revisit the sidebands phenomenon in the conventional FT-ICR MS, specifically applied to macromolecules.

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