Patents Assigned to California Institute of Technology, a non-profit organization
  • High-efficiency electron ionizer for a mass spectrometer array
    Publication number: 20010038077
    Abstract: The present invention provides an improved electron ionizer for use in a quadrupole mass spectrometer. The improved electron ionizer includes a repeller plate that ejects sample atoms or molecules, an ionizer chamber, a cathode that emits an electron beam into the ionizer chamber, an exit opening for excess electrons to escape, at least one shim plate to collimate said electron beam, extraction apertures, and a plurality of lens elements for focusing the extracted ions onto entrance apertures.
    Type: Application
    Filed: July 10, 2001
    Publication date: November 8, 2001
    Applicant: California Institute of Technology, a non-profit organization
    Inventors: Ara Chutjian, Murray R. Darrach, Otto J. Orient