Anharmonic contributions in real RF linear quadrupole traps

Details Anharmonic contributions in real RF linear quadrupole traps Anharmonic contributions in real RF linear quadrupole traps

2010-01-09

arxiv.org/abs/1001.1403v1

Physics

Instrumentation and Detectors

Accepted for publication at International Journal of Mass Spectrometry

Scientific paper

The radiofrequency quadrupole linear ion trap is a widely used device in physics and chemistry. When used for trapping of large ion clouds, the presence of anharmonic terms in the radiofrequency potential limits the total number of stored ions. In this paper, we have studied the anharmonic content of the trapping potential for different implementations of a quadrupole trap, searching for the geometry best suited for the trapping of large ion clouds. This is done by calculating the potential of a real trap using SIMION8.0, followed by a fit, which allows us to obtain the evolution of anharmonic terms for a large part of the inner volume of the trap.

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