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Chemistry LibreTexts

Molecular Ion Peak

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In a mass spectrum, the peak representing the molecular ion is called the molecular ion peak (symbol: M peak). Excluding any peaks due to the presence of heavier isotopes, the molecular ion peak is the peak with the highest mass-to-charge ratio.

see also base peak


This page titled Molecular Ion Peak is shared under a All Rights Reserved (used with permission) license and was authored, remixed, and/or curated by Gamini Gunawardena via source content that was edited to the style and standards of the LibreTexts platform.

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