Ejection of ion clouds from 3D RF ion traps

The invention relates to the collective ejection of all ions from within a three-dimensional RF ion trap, particularly for their transfer to Kingdon ion traps or other mass analysers. The invention proposes a method in which ions 15 are initially trapped by applying a RF voltage 1 from a high-qualit...

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Bibliographic Details
Main Authors RALF HARTMER, ANDREAS BREKENFELD, CHRISTOPH GEBHARDT
Format Patent
LanguageEnglish
Published 07.05.2014
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
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Summary:The invention relates to the collective ejection of all ions from within a three-dimensional RF ion trap, particularly for their transfer to Kingdon ion traps or other mass analysers. The invention proposes a method in which ions 15 are initially trapped by applying a RF voltage 1 from a high-quality resonant circuit 30 & 31 to the traps ring electrode 13, before replacing this first RF voltage with a second RF voltage 2 applied to the traps end cap electrodes12 & 14 so as to keep the ions stored within the trap, said further RF voltage 2 being more rapidly switchable than the high voltage at the ring electrode 13. The second RF voltage at the end cap electrodes 13 & 14 is then abruptly switched down or off, the released ions being ejected through an opening in one of the end cap electrodes by applying a DC voltage to at least one of the end cap electrodes.
Bibliography:Application Number: GB20130011410