mass spectrometer focusing system (deflection system)

https://doi.org/10.1351/goldbook.M03736
An assembly permitting the separation of ions according to their mass-to-charge ratio.
Source:
PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2200 (https://doi.org/10.1351/pac199062112167)