METHOD FOR TRAPPING IONS INTO ION TRAPS AND ION TRAP MASS SPECTROMETER SYSTEM THEREOF

摘要

A method and mass spectrometer system for trapping ions within an ion trap by increasing the flight path of ions therein. An ion beam is produced by external ion source and is directed to the ion trap which comprises at least one trapping electrode in proximity to an exit region of the ion beam from the ion trap. A retarding DC voltage is applied to the trapping electrode during ion accumulation time for creating a fringing reflection field for retaining ions within the ion trap.