Mass spectral behavior of n‐alkynes

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Abstract
The 70 e V‐electron impact mass spectra of the C7–C10 n‐alkynes have been determined as well as the metastable ion spectra of the molecular ions and the [CS2]+ and [N2O]+ charge exchange mass spectra of the C7‐C9 n‐alkynes. The metastable ion mass spectra provide only a limited opportunity to distinguish between isomers; however, the 70‐eV EI mass spectra of isomeric compounds permit a ready distinction between isomers. The [CS2]+ charge exchange mass spectra of isomeric compounds also show substantial differences. The [N2O]+ charge exchange mass spectra do not show the enhancement of β‐fission fragments observed in field ionization experiments, despite representing ions of similar internal energy, and it is concluded that field dissociation is responsible for the β‐fission fragments in the field ionization experiments.