title: A compact E × B filter: A multi-collector cycloidal focusing mass spectrometer.
abstract: 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.
authors.affiliation: Southwest Research Institute, 6220 Culebra Road, San Antonio, Texas 78238, USA.
authors.forename: Ryan C
authors.initials: RC
authors.lastname: Blase
authors.affiliation: Southwest Research Institute, 6220 Culebra Road, San Antonio, Texas 78238, USA.
authors.forename: Greg
authors.initials: G
authors.lastname: Miller
authors.affiliation: The Johns Hopkins University Applied Physics Laboratory LLC, 11100 Johns Hopkins Road, Laurel, Maryland 20723, USA.
authors.forename: Joseph
authors.initials: J
authors.lastname: Westlake
authors.affiliation: Southwest Research Institute, 6220 Culebra Road, San Antonio, Texas 78238, USA.
authors.forename: Tim
authors.initials: T
authors.lastname: Brockwell
authors.affiliation: Department of Integrative Biology, Michigan State University, 288 Farm Lane RM 203, East Lansing, Michigan 48824, USA.
authors.forename: Nathaniel
authors.initials: N
authors.lastname: Ostrom
authors.affiliation: Department of Integrative Biology, Michigan State University, 288 Farm Lane RM 203, East Lansing, Michigan 48824, USA.
authors.forename: Peggy H
authors.initials: PH
authors.lastname: Ostrom
authors.affiliation: Southwest Research Institute, 6220 Culebra Road, San Antonio, Texas 78238, USA.
authors.forename: J Hunter
authors.initials: JH
authors.lastname: Waite
mesh_terms: D004583:Electrons; D004867:Equipment Design; D007477:Ions; D059346:Magnets; D013058:Mass Spectrometry / Q000295:instrumentation*; D059206:Natural Gas / Q000032:analysis; D009584:Nitrogen / Q000032:analysis
chemical_list: D007477:Ions; D059206:Natural Gas; D009584:Nitrogen