Abstract
The quadrupole mass filter is currently used in the most popular type of mass spectrometer, but its characteristics are not fully understood. A simple iterative method of numerical computation has been used to simulate ion trajectories in an ideal quadrupole field. The method is based on elementary equations of classical physics. Comparisons have been made with numerical integration techniques and matrix methods. A preliminary study of the quadrupole mass filter including an investigation of ion exit distributions with this iterative approach is presented. The distributions of ensembles of ions at the exit of the quadrupole field are presented with the aid of computer graphics.
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