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Simulations and experiments on the motion of collections of ions show that impulsive excitation, applied in the axial direction, forces ions into coherent motion with characteristic secular frequencies. A version of the ion trap simulation program, itsim, which accounts for the effects of ion/molecule collisions, is applied to show that this motion is remarkably stable even in the presence of bath...
An experimental and theoretical study has been carried out in which ion peaks measured using a discrete electrode detector array placed in the focal plane of a mass spectrometer are compared with the results produced by an array simulator programmed in Mathcad. All known factors influencing a peak profile have been included in the simulator. The activation of several electrodes in single events...
The trajectories of ions confined individually in a commercial quadrupolar ion trap of stretched geometry and subjected to resonant excitation have been calculated. During resonant excitation, the average ion kinetic energy increases when the ion secular frequency motion is in phase with the resonant excitation and decreases when the phases are opposed. The temporal variation of ion kinetic energy...
Procedures are described for displaying trajectories of ions in an ion trap mass spectrometer in a three-dimensional fashion, and also for displaying the corresponding projections onto individual planes. The ion trap simulation program itsim was employed to simulate ion motion and produce an ASCII file containing the spatial and temporal coordinates of the ions studied, and a three-dimensional plotting...
We simulate an operating mode in which the ions are introduced inside a quadrupole trap and slowed down to be confined; after a given confinement time, they are ejected out of the trap towards the detector through the upper end-cap. This elementary experiment is repeated for a set of increasing confinement times. The temporal ion signal obtained is an image of the confined ions' motion. This signal,...
The purpose of this simulation is to understand the contribution of the parameters of the new protocol of ion mass analysis which we have developed in previous papers and to improve the data treatment in order to predict the experimental results. In this first simulation paper, we limit the study to an ion cloud of the same species.The first part describes the formalism chosen to simulate the ion...
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