This term is used to describe the relative occurrence of an ion. A mass spectrum is a plot of  the ion abundances against the m/z values determined and is normalised to the most abundant ion. This term should be distinguished from intensity which, while appropriate for the signal of the individual ion peak detected, is not used in spectra.

The term "abundance" was found in the following pages:

ICBTECE 2021: 15. International Conference on Biogeochemistry, Trace Elements and Chemical Engineering | EVISA's Agenda of Events
Instrument database: Bruker Daltonics - HCT/HCTplus
Instrument database: Varian Inc. - Ultramass 700 ICP-MS
Instrument database: Waters Corporation - Q-TOF Ultima API
Quantification of copper chlorophylls in green table olives | EVISA's News
Instrument database: CETAC Technologies - AridusTM Desolvating Nebulizer System
Instrument database: Nu Instruments Ltd. - Noblesse
New insights on arsenic cycling | EVISA's News
All about Atomic Spectrometry - Resources related to Atomic Spectrometry | EVISA's News
New reference materials for the characterisation of selenium-enriched food products | EVISA's News
Chromium Isotope Ratio as a Tool to Track the Redox State of the Earth | EVISA's News
Instrument database: Nu Instruments Ltd. - Plasma 1700
Isotopic measurements and speciation analysis | EVISA's News
Link database: Mineral Information Institute: Thorium
Certified reference materials for selenium speciation | EVISA's News
Link database: Chemical Fact Sheet: Helium
Postponed: HPLC 2020: 50th International Symposium on High Performance Liquid Phase Separations and Related Techniques | EVISA's Agenda of Events
Material database: National Research Council of Canada (NRC - CNRC) - EMMS-1: Enriched methylmercury isotopic certified reference material
Journals database: Isotopes in Environmental and Health Studies
Instrument database: Thermo Scientific - Q Exactive™ Focus - Hybrid Quadrupole-Orbitrap Mass Spectrometer