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Preferred Label : protonated molecule;

Detailed label : protonated molecule in mass spectrometry;

IUPAC definition : An ion formed by interaction of a molecule with a proton abstracted from an ion, as often occurs in chemical ionization according to the reaction: M XH MH X . The symbolism [M H] sup class plus /sup may also be used to represent the protonated molecule. The widely used term 'protonated molecular ion' to describe the MH sup class plus /sup ion is not recommended, since it suggests an associated product of a proton with a molecular ion.;

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An ion formed by interaction of a molecule with a proton abstracted from an ion, as often occurs in chemical ionization according to the reaction: M XH MH X . The symbolism [M H] sup class plus /sup may also be used to represent the protonated molecule. The widely used term 'protonated molecular ion' to describe the MH sup class plus /sup ion is not recommended, since it suggests an associated product of a proton with a molecular ion.

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28/07/2025


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