![]() The molecular ion is often given the symbol M + or - the dot in this second version represents the fact that somewhere in the ion there will be a single unpaired electron. Note: If you aren't sure about how a mass spectrum is produced, it might be worth taking a quick look at the page describing how a mass spectrometer works. These electrons have a high enough energy to knock an electron off an organic molecule to form a positive ion. When the vaporised organic sample passes into the ionisation chamber of a mass spectrometer, it is bombarded by a stream of electrons. Using a mass spectrum to find relative formula mass It also shows how high resolution mass spectra can be used to find the molecular formula for a compound. This page explains how to find the relative formula mass (relative molecular mass) of an organic compound from its mass spectrum. MASS SPECTRA - THE MOLECULAR ION (M +) PEAK Mass spectra - the molecular ion (M+) peak
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