## electron ionization

in mass spectrometry
https://doi.org/10.1351/goldbook.E01999
This is the term used to describe ionization of any species by electrons. The process may, for example, be written:
• for atoms or molecules: $\text{M} + e \rightarrow \text{M}^{+\cdot } + 2e$
• for radicals: $\text{M}^{\cdot} + e \rightarrow \text{M}^{+} + 2e$
The term 'electron impact' should not be used.