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- W2950712993 abstract "The photostability of C{sub 10}D{sub 8}{sup +} and C{sub 10}D{sub 8}{sup 2+} is investigated between 8 and 35 eV by threshold photoelectron-photoion coincidence (T-PEPICO) measurements using monochromatized synchrotron radiation as excitation source for naphthalene. MNDO calculations were used to interpret photoelectron spectra. The threshold photoelectron spectrum shows evidence of extensive autoionization, considered to be mainly to high vibrational levels of the X{sup 2} A{sub u} state of C{sub 10}D{sub 8}{sup +}. The possibility of a kinetic isotope effect on dissociation is discussed. Fragmentation processes, thresholds, and cutoffs are interpreted. The dissociation rates of the process C{sub 10}D{sub 8}{sup +} {yields} C{sub 8}D{sub 6}{sup +} + C{sub 2}D{sub 2} are measured between 16 and 17.7 eV. The results of an RRKM calculation are fitted to the experimental results to give an activation energy of 3.50 eV and activation entropy {Delta}S{sup {double dagger}} = 14.1 J/mol{center dot}K at 1000 K. A mechanistic model of this dissociation is propose din terms of two successive C-C bond rupture processes. Appearance potentials determined for the dications C{sub 10}D{sub 8}{sup 2+} (21.5 {plus minus} 0.5 eV) and C{sub 8}D{sub 6}{sup 2+} (23.5 {plus minus} 0.5 eV) are about 1 eV lower than electron impact values. Applicationmore » of the results to interstellar polycyclic aromatic hydrocarbons is briefly discussed. Further work with improved mass resolution is proposed.« less" @default.
- W2950712993 created "2019-06-27" @default.
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- W2950712993 date "1989-11-21" @default.
- W2950712993 modified "2023-09-27" @default.
- W2950712993 title "ChemInform Abstract: Single and Double Photoionization Processes in Naphthalene Between 8 and 35 eV" @default.
- W2950712993 cites W1992336395 @default.
- W2950712993 doi "https://doi.org/10.1002/chin.198947035" @default.
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