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Issue 18, 2011
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Dissociative double photoionization of benzene molecules in the 26–33 eV energy range

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Abstract

A time-of-flight mass spectrometer with a position sensitive ion detector was used to study the dissociative double ionization of benzene by UV synchrotron radiation. The threshold energy for the main dissociative processes, leading to CH3+ + C5H3+, C2H3+ + C4H3+ and C2H2+ + C4H4+ ion pairs were characterized by exploiting a photoelectron-photoion-photoion-coincidence technique, giving 27.8 ± 0.1, 29.5 ± 0.1, and 30.2 ± 0.1 eV, respectively. The first reaction also proceeds via the formation of a metastable C6H62+ dication. The translational kinetic energy of the ionic products was evaluated by measuring the position of ions arriving to the detector. Theoretical calculations of the energy and structure of dissociation product ions were performed to provide further information on the dynamics of the charge separation reactions following the photoionization event.

Graphical abstract: Dissociative double photoionization of benzene molecules in the 26–33 eV energy range

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Publication details

The article was received on 26 Nov 2010, accepted on 04 Mar 2011 and first published on 24 Mar 2011


Article type: Paper
DOI: 10.1039/C0CP02678F
Citation: Phys. Chem. Chem. Phys., 2011,13, 8245-8250
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    Dissociative double photoionization of benzene molecules in the 26–33 eV energy range

    M. Alagia, P. Candori, S. Falcinelli, F. Pirani, M. S. P. Mundim, R. Richter, M. Rosi, S. Stranges and F. Vecchiocattivi, Phys. Chem. Chem. Phys., 2011, 13, 8245
    DOI: 10.1039/C0CP02678F

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