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US08742330B2 Specific phase range for ion injection into ion trap device 有权
离子注入离子阱装置的特定相位范围

Specific phase range for ion injection into ion trap device
Abstract:
When ions accumulated in the exit side end of ion guide are to be injected into ion trap as packets, the application of square wave high frequency voltage to ring electrode from main voltage generating unit is stopped. Once nearly all the ions have been injected into ion trap, the application of square wave high frequency voltage from main voltage generating unit to ring electrode is momentarily started, at which time the application of square wave high frequency voltage is started from a phase in the range of 90°±40° or 270°±40°. It is thereby possible to reduce the extent of spread of ions immediately after application of high frequency voltage and to improve the ion trapping efficiency.
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