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High-efficiency electron ionizer for a mass spectrometer array (2001)

Orient, Otto J. ; Chutjian, Ara ; Darrach, Murray R.

In: CASI

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Publication Date: 2019-08-16

Description: 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.

Keywords: Instrumentation and Photography

Format: application/pdf

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