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- W2106720234 abstract "Photodissociation spectra and ion—molecule reaction kinetics of the molecular ions of all C4-, C5- and some of the C6-alkenes and cyclopropane, cyclobutane and cyclohexane are discussed. From the spectra it is deduced that cyclobutane molecular ions ring open directly upon ionization, whereas for the molecular ions of cyclopropane and cyclohexene a mixture of cyclic and acyclic ions is formed. The fraction of C3 H6-+ ions from cyclopropane that isomerize to the propene structure appears to be strongly dependent on the energy of the ionizing electrons. The three linear butene ions cannot be distinguished by the photodissociation spectra alone; isobutene molecular ions retain their original structure upon ionization. For some of the C5- and C6-alkenes studied it follows from both the photodissociation spectra and the kinetics of ion—molecule reactions, that upon ionization two isomeric molecular ions with strongly different reactivity and photodissociation spectra are formed. In all cases, the reactivity ions have a larger photodissociation rate in the visible region than the less reactive ions. Some possibilities in relation to the nature of these two ions are discussed. No straightforward explanation can be given for the observed phenomena. An explanation in terms of differences both in the position of the double bond and the sterical structure (non-planarity of the double bond as well as rotation of single bonds in the terminal ethyl-group) must presumably be taken into consideration." @default.
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- W2106720234 date "1981-10-01" @default.
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- W2106720234 title "Isomerization of molecular ions of alkenes and cycloalkanes studied by photodissociation in an ICR spectrometer" @default.
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