Principal ion

From MS Terms
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The most abundant ion of an isotope cluster, such as the 11B79Br281Br+. ion of m/z 250 of the isotope cluster of molecular ions of BBr3. The term principal ion has also been used to describe ions that have been artificially isotopically enriched in one or more positions such as CH3 13CH3+. or CH2D2+, but those are best defined simply as isotopologue ions.