Sector mass spectrometer
Class of mass spectrometer / From Wikipedia, the free encyclopedia
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This article is about mass spectrometers. For sector compasses, see sector (instrument).
A sector instrument is a general term for a class of mass spectrometer that uses a static electric (E) or magnetic (B) sector or some combination of the two (separately in space) as a mass analyzer.[1] Popular combinations of these sectors have been the EB, BE (of so-called reverse geometry), three-sector BEB and four-sector EBEB (electric-magnetic-electric-magnetic) instruments. Most modern sector instruments are double-focusing instruments (first developed by Francis William Aston, Arthur Jeffrey Dempster, Kenneth Bainbridge and Josef Mattauch in 1936[2]) in that they focus the ion beams both in direction and velocity.[3]