ion collector

in mass spectrometry
https://doi.org/10.1351/goldbook.I03161
Device for the capture of selected ions such as a Faraday cup collector (with a d.c. amplifier) or an electron multiplier.
Source:
PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2200 (https://doi.org/10.1351/pac199062112167)