Ion packet generation for mass spectrometer

  • US 6,455,845 B1
  • Filed: 04/20/2000
  • Issued: 09/24/2002
  • Est. Priority Date: 04/20/2000
  • Status: Expired due to Term
First Claim
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1. A method of providing an ion packet to an analyzer section of a mass spectrometer from an ion beam, comprising:

  • applying a field pulse to extract an ion packet from a region of the beam at a sideways direction to the beam and provide said ion packet to a mass analyzer section of the mass spectrometer, which pulse simultaneously causes non-extracted ions of the beam to be deflected onto an electrode of opposite charge to said non-extracted ions;

    wherein a pulse ON time is at least twice as long as a pulse ON time required to extract the ion packet and provide said ion packet to the mass analyzer section, so as to reduce stray ions entering the mass analyzer section.

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