FIELD: physics.
SUBSTANCE: invention relates to mass-spectrometric analysis, particularly to an ion trap, multipolar electrode system and an electrode terminal. The electrode terminal (1) is a rod and at least one side of its section has a stepped shape, which comprises two or more steps. This forms the structure of the electrode terminal.
EFFECT: mass-spectrometres with a multipolar electrode system, ion trap and which use electrode terminal (1) have an optimised shape of field and can be easily made at low cost.
43 cl, 27 dwg
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