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

P. Francheschi 1 Daniela Ascenzi 1 Paolo Tosi 1 Roland Thissen 2 Jan Zabka 3 Jana Roithová 4 Claire L. Ricketts 5 Monica de Simone 6 Marcello Coreno 7
1 Dipartimento di Fisica [Povo]
2 Laboratoire de Chimie Physique
3 V. Čermák Laboratory
4 IOCB / CAS - Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences
5 Department of Chemistry [UCL, London]
6 Laboratorio Nazionale TASC
7 IMIP-CNR - Istituto di Metodologie Inorganiche e di Plasmi (IMIP)-CNR
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.
Keywords : ELECTRON-IMPACT IONIZATION CROSS-SECTIONS ANGULAR-DISTRIBUTIONS DIATOMIC-MOLECULES COULOMB EXPLOSION IONIZED MOLECULES UPPER-ATMOSPHERE ION COINCIDENCE HIGH-RESOLUTION KINETIC-ENERGY
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https://hal-insu.archives-ouvertes.fr/insu-00359419
Contributor : Béatrice Pibaret-Bourdon <>
Submitted on : Friday, February 6, 2009 - 6:13:44 PM
Last modification on : Wednesday, December 23, 2020 - 3:04:03 PM

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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, American Institute of Physics, 2007, 126 (13), pp.134310. ⟨10.1063/1.2714521⟩. ⟨insu-00359419⟩

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