Noise reduction in negative-ion quadrupole mass spectrometry

Patent · 31 December 1992

OSTI ID:868753

Chastagner, Philippe ^[1]

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1. 3134 Natalie Cir., Augusta, GA 30909-2748

A quadrupole mass spectrometer (QMS) system having an ion source, quadrupole mass filter, and ion collector/recorder system. A weak, transverse magnetic field and an electron collector are disposed between the quadrupole and ion collector. When operated in negative ion mode, the ion source produces a beam of primarily negatively-charged particles from a sample, including electrons as well as ions. The beam passes through the quadrupole and enters the magnetic field, where the electrons are deflected away from the beam path to the electron collector. The negative ions pass undeflected to the ion collector where they are detected and recorded as a mass spectrum.

• Research Organization: WESTINGHOUSE SAVANNAH RIVER CO
• DOE Contract Number: AC09-89SR18035
• Assignee: Chastagner, Philippe (3134 Natalie Cir., Augusta, GA 30909-2748)
• Patent Number(s): US 5204530
• OSTI ID: 868753
• Country of Publication: United States
• Language: English

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beam
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beam path
charged particle
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detected
disposed
electron
electron collector
electrons
enters
field
filter
including
magnetic
magnetic field
mass
mass filter
mass spectrometer
mass spectrometry
mode
negative
negative-ion
negatively-charged
noise
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particles
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primarily
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quadrupole
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sample
source
source produces
spectrometer
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transverse
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undeflected
weak