A compact E × B filter: A multi-collector cycloidal focusing mass spectrometer

A compact E × B mass spectrometer is presented. The mass spectrometer presented is termed a "perfect focus" mass spectrometer as the resolution of the device is independent of both the initial direction and energy of the ions (spatial and energy independent). The mass spectrometer is small...

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Bibliographic Details
Published in:Review of scientific instruments 2015-10, Vol.86 (10), p.105105-105105
Main Authors: Blase, Ryan C, Miller, Greg, Westlake, Joseph, Brockwell, Tim, Ostrom, Nathaniel, Ostrom, Peggy H, Waite, J Hunter
Format: Article
Language:English
Subjects:
DETECTION
Electrons
Equipment Design
FARADAY CUPS
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ION BEAMS
Ion currents
ION SOURCES
Ions
ISOTOPE RATIO
Magnets
MASS RESOLUTION
MASS SPECTRA
MASS SPECTROMETERS
Mass Spectrometry - instrumentation
Natural Gas - analysis
Nitrogen - analysis
PERMANENT MAGNETS
Scientific apparatus & instruments
SENSITIVITY
Signal monitoring
SIGNALS
Slits
Weight
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Summary:A compact E × B mass spectrometer is presented. The mass spectrometer presented is termed a "perfect focus" mass spectrometer as the resolution of the device is independent of both the initial direction and energy of the ions (spatial and energy independent). The mass spectrometer is small in size (∼10.7 in.(3)) and weight (∼2 kg), making it an attractive candidate for portability when using small, permanent magnets. A multi-collector Faraday cup design allows for the detection of multiple ion beams in discrete collectors simultaneously; providing the opportunity for isotope ratio monitoring. The mass resolution of the device is around 400 through narrow collector slits and the sensitivity of the device follows expected theoretical calculations of the ion current produced in the electron impact ion source. Example mass spectra obtained from the cycloidal focusing mass spectrometer are presented as well as information on mass discrimination based on instrumental parameters and isotope ratio monitoring of certain ion signals in separate Faraday cups.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4932184