even-electron ion

https://doi.org/10.1351/goldbook.E02228
An ion containing no unpaired electrons, for example CH3+ in its @G02704@.
Source:
PAC, 1991, 63, 1541. (Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1549 [Terms] [Paper]