Free interactive chemistry · SIM-SPEC-MS-001

Mass spectrometry

A mass spectrum: the molecule breaks into charged fragments, sorted by mass.

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How to use this simulation

Choose a molecule.
Tap a peak to see the ion, its formula and what was lost.

What to notice

The heaviest significant peak is usually the molecular ion M⁺.
Differences between peaks show the pieces that broke off (15 = CH₃).

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Find the peak for loss of a methyl group.

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