Mass spectrum

A plot of the relative abundances of ions forming a beam or other collection as a function of the their m/z values.

A spectrum that is obtained when a beam of ions is separated according to the mass/charge (m/z) ratios of the ionic species contained within it.

http://goldbook.iupac.org/M03749.html

A spectrum which is obtained when a beam of ions is separated according to the mass-to-charge (m/z) ratios of the ionic species contained within it.

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 1550

See also: Orange Book, p. 204 PAC, 1990, 62, 2167 (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2200

Plot of ion abundance vs. mass-to-charge ratio normalized to most abundant ion.