Internal energy effects on the ion/molecule reactions of ionized methyl isocyanide.
EUROPEAN JOURNAL OF MASS SPECTROMETRY(2008)
摘要
Electron ionization of methyl isocyanide in various chemical ionization conditions is reported and, depending on the energy conditions used, different ion/molecule reactions are observed. It is proposed, on the basis of combined quantum chemical (DFT) calculations and tandem mass spectrometric experiments, that a common intermediate could be a cumulenic ionized dimer dissociating in the ion source following two energy depending competitive channels, a Loss of a hydrogen atom and a loss of a methyl group. Proposed structures for new cumulenic ions are supported by collision experiments in the high (collisional activation) or/and low (collision-induced dissociations) translational energy regime.
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关键词
methyl isocyanide,chemical ionization,ion/molecule reactions,cumulenic ions
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