Abstract
The factors responsible for temporal variation of the detected frequency in an FT ion cyclotron resonance (ICR) spectrometer are analysed. The time-dependent frequency behaviour is believed to be caused by a change in ion cloud configuration, the number of detected ions, and the ion cloud position in the electric field of the ICR cell. The spectral peak shape is calculated for an ensemble of non-interacting ions distributed over amplitudes of axial oscillations. The influence of the Coulomb interaction on the signal and the spectral peak shape is studied by a computer simulation using a highly parallel computer.
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