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Unimolecular decay measurements of secondary ions from organic molecules by time-of-flight mass spectrometry

Schueler, B. ; Beavis, R. ; Ens, W. ; Main, D.E. ; Tang, X. ; Standing, K.G.

International journal of mass spectrometry and ion processes, 1989-09, Vol.92, p.185-194

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Título:
Unimolecular decay measurements of secondary ions from organic molecules by time-of-flight mass spectrometry
Autor: Schueler, B. ; Beavis, R. ; Ens, W. ; Main, D.E. ; Tang, X. ; Standing, K.G.
Assuntos: Chemistry ; Exact sciences and technology ; Mass spectrometry ; Organic chemistry ; Reactivity and mechanisms
É parte de: International journal of mass spectrometry and ion processes, 1989-09, Vol.92, p.185-194
Descrição: Unimolecular dissociations of positive ions ejected by keV Cs + bombardment from para-substituted phenylalanine F-X (X = H, HO, OCH 3 and halides) were studied by time-of-flight mass spectrometry. The first-order rates of dissociation and the corresponding fragmentation pathways were determined with the aid of a movable 45° ion mirror. Variation of ion yields and fragmentation pathways for [M + H] +, [M + Na] +, [M + 2Na - H] +, [M-45] +, and [tropylium] + decompositions were observed for the various substituents. The effect of varying the primary ion energy from 3 to 13 keV was studied for the ion yields and decay constants from phenylalanine (X=H). Although the ion intensities varied significantly, especially at low primary ion energies, the rate constants remained unchanged.
Editor: Amsterdam: Elsevier B.V
Idioma: Inglês

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