Abstract
The mass selective axial instability mode without a light buffer gas for a three dimensional ion trap was investigated. This technique is different from the well-known “mass selective axial instability mode” and based on radial injection of an ionizing electron beam into the analyzer without a light buffer gas. The influence of the axial dimensions of the ionization region, the range of initial phase of ionization, and the scan speed on the features of the analyzer is obtained from the numerical simulations. It is shown that the presence of a light buffer gas decreases the maximum resolution that can be achieved in this mode. We present here experimental results and mass spectra of different organic compounds obtained with the ion trap operated in the mass selective instability mode without a light buffer gas.
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