Mass spectrometer

Details Mass spectrometer Mass spectrometer

2007-11-20

2007-11-20

Assouad, Patrick (Department: 2809)

Radiant energy

With charged particle beam deflection or focussing

Magnetic lens

C250S281000, C250S282000, C250S287000

Reexamination Certificate

active

10989646

ABSTRACT:
A mass filter is disclosed comprising an orthogonal acceleration electrode9. Ions entering the mass filter are orthogonally accelerated by the orthogonal acceleration electrode9in a primary acceleration region2and enter a flight region3. The ions6,7,8are then reflected by a reflectron4and are directed towards an exit region of the mass filter. Ions having a desired mass to charge ratio are arranged to arrive in the primary acceleration region2at a time when a voltage pulse applied to the orthogonal acceleration electrode9falls from a maximum to zero. Ions having a desired mass to charge ratio are orthogonally decelerated such that they have a zero component of velocity in the orthogonal direction. Accordingly, ions having a desired mass to charge ratio exit the mass filter in an axial direction.

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