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Model for ion injection into a quadrupole ion trap to assess the distribution of initial conditions of confinement
Author(s) -
Janulyte A.,
Zerega Y.,
Carette M.,
Reynard C.,
Andre J.
Publication year - 2008
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.3635
Subject(s) - ion , chemistry , ion trap , quadrupole ion trap , trap (plumbing) , atomic physics , quadrupole , ion source , position (finance) , physics , organic chemistry , finance , meteorology , economics
A pulsed ion‐injection mode for a quadrupole ion trap is described. Switched direct current (d.c.) potentials are applied to the source and trap electrodes to inject the ions into the trap and slow them down. The injection time is sufficient to ensure a steady distribution of the injected ions at the beginning of the confinement. An elementary uni‐dimensional model is detailed giving the axial positions and velocities of the ions injected into the trap. The ion distribution in phase space, the number of injected ions and the number of injected ions that will be trapped are also given. These expressions depend on ion position and velocity at the creation, applied potentials and spatial location of the source and trap electrodes. This model is validated by comparing simulation and experimental results. For this purpose the number of confined ions is plotted versus the slowing‐down potentials applied on the ring and the upper end‐cap of the trap. The size of the area of removable ions in the source is deduced from these results. Copyright © 2008 John Wiley & Sons, Ltd.