| 摘要 |
In a mass spectrometry system, a method of operating a processing section, for example a collision cell, is provided. The method is based on the realization that some interfering ions after collision will have significantly lower kinetic energy than desired analyte ions. These interfering ions can be ions originating from the source, or product ions formed by reaction with gas particles, or ions produced by other processes within the cell. Significantly, these interfering ions can have lower kinetic energies, as compared to desired analyte ions, but this energy differential disappears, or is much reduced, at the exit of the collision cell, rendering post-cell energy discrimination less effective. The invention provides a field within the cell to discriminate against the interfering ions based on their lower kinetic energy.
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