Dissociative double photoionization of N2 using synchrotron radiation: Appearance energy of the N2+ dication - Archive ouverte HAL Access content directly
Journal Articles Journal of Chemical Physics Year : 2007

Dissociative double photoionization of N2 using synchrotron radiation: Appearance energy of the N2+ dication

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Abstract

Photoionization cross sections for the production of the doubly charged ion N2+ from N2 have been measured by means of synchrotron radiation in the photon energy range from 50 to 110 eV. The appearance energy for N2+ has been determined as 55.2±0.2 eV, i.e., about 1.3 eV higher than the spectroscopic dissociation limit leading to the charge asymmetric dissociation channel N2+(2P)+N(4S) at 53.9 eV. The onset of a second threshold at 59.9±0.2 eV is detected and the energy dependence of photoion intensities near the threshold regions is interpreted in terms of the Wannier theory. The production of the N2+ dication is discussed in terms of direct and indirect mechanisms for dissociative charge asymmetric photoionization and by comparison with the potential energy curves of the intermediate N22+ dication. Experimental evidences for the opening of the Coulomb explosion channel N2++N+ at high photon energies are provided by measuring the kinetic energy release spectra of N2+ fragments at selected photon energies.
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Dates and versions

insu-00359419 , version 1 (06-02-2009)

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P. Francheschi, Daniela Ascenzi, Paolo Tosi, Roland Thissen, Jan Zabka, et al.. Dissociative double photoionization of N2 using synchrotron radiation: Appearance energy of the N2+ dication. Journal of Chemical Physics, 2007, 126 (13), pp.134310. ⟨10.1063/1.2714521⟩. ⟨insu-00359419⟩
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