In‐beam electron impact mass spectrometry of aliphatic alcohols

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<jats:title>Abstract</jats:title><jats:p>The characteristics of the in‐beam electron impact mass spectra of six isomers of undecanol as well as several 1‐alkanols have been examined. In addition to the characteristic ions observed in the conventional electron impact spectra, the [2M+1]<jats:sup>+</jats:sup>, [2M+1‐H<jats:sub>2</jats:sub>O]<jats:sup>+</jats:sup>, [2M+1‐2H<jats:sub>2</jats:sub>O]<jats:sup>+</jats:sup>, [2M‐R or R′]<jats:sup>+</jats:sup>, [2M‐H<jats:sub>2</jats:sub>OR or R′]<jats:sup>+</jats:sup>, [2M2H<jats:sub>2</jats:sub>OR or R′]<jats:sup>+</jats:sup> and [M+1H<jats:sub>2</jats:sub>O]<jats:sup>+</jats:sup> peaks are common in the in‐beam electron impact mass spectra of the undecanol isomers of structure RCH(OH)R′. Deuterium labelling experiments have shown that the extra proton in the protonated dimer ions, [2M+1]<jats:sup>+</jats:sup>, originates from the hydroxy group. The processes which produce the important peaks in the high <jats:italic>m</jats:italic>/<jats:italic>e</jats:italic> regions are discussed.</jats:p>

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