Noise reduction in negative-ion quadrupole mass spectrometry

Patent · Tue Apr 20 00:00:00 EDT 1993

OSTI ID:6260685

Chastagner, P

A quadrupole mass spectrometer (QMS) system is described 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.

• DOE Contract Number: AC09-89SR18035
• Assignee: IMS; EDB-93-121420
• Patent Number(s): US 5204530; A
• Application Number: PPN: US 7-813730
• OSTI ID: 6260685
• Resource Relation: Patent File Date: 27 Dec 1991
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
47 OTHER INSTRUMENTATION
MASS SPECTROMETERS
DESIGN
OPERATION
ELECTRONS
FILTERS
ION SOURCES
IONS
MAGNETIC FIELDS
MASS SPECTRA
MASS SPECTROSCOPY
MATERIALS
PARTICLE PRODUCTION
QUADRUPOLES
CHARGED PARTICLES
ELEMENTARY PARTICLES
FERMIONS
LEPTONS
MEASURING INSTRUMENTS
MULTIPOLES
SPECTRA
SPECTROMETERS
SPECTROSCOPY
400102* - Chemical & Spectral Procedures
440800 - Miscellaneous Instrumentation- (1990-)