mass peak

in mass spectrometry
https://doi.org/10.1351/goldbook.M03728
A record of the ion current, at a specific mass to charge ratio, received by the collector.
Source:
PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2200 (https://doi.org/10.1351/pac199062112167)