magnetic sector

https://doi.org/10.1351/goldbook.12473
Device that produces a magnetic field perpendicular to a charged particle beam that deflects the beam to an extent that is proportional to the ratio of particle momentum and charge.
Note: For a mono-energetic beam, the deflection is proportional to m/z.
Source:
PAC, 2013, 85, 1515. (Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)) on page 1562 [Terms] [Paper]