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Luca Schio  - - - 
Top co-authors See all
Robert Richter

209 shared publications

Marzio Rosi

147 shared publications

Dipartimento di Ingegneria Civile ed Ambientale, Università di Perugia, 06125 Perugia, Italy

Raimund Feifel

136 shared publications

Department of Physics, University of Gothenburg, 412 96 Gothenburg, Sweden

Stefano Falcinelli

70 shared publications

Stefano Stranges

38 shared publications

IOM-CNR Tasc Laboratory, SS-14, Km 163.5, Area Science Park, 34149 Basovizza, Trieste, Italy

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Publication Record
Distribution of Articles published per year 
(2015 - 2018)
Total number of journals
published in
 
7
 
Publications See all
Article 1 Read 2 Citations Double photoionization of propylene oxide: A coincidence study of the ejection of a pair of valence-shell electrons Stefano Falcinelli, Franco Vecchiocattivi, Michele Alagia, L... Published: 21 March 2018
The Journal of Chemical Physics, doi: 10.1063/1.5024408
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Propylene oxide, a favorite target of experimental and theoretical studies of circular dichroism, was recently discovered in interstellar space, further amplifying the attention to its role in the current debate on protobiological homochirality. In the present work, a photoelectron-photoion-photoion coincidence technique, using an ion-imaging detector and tunable synchrotron radiation in the 18.0–37.0 eV energy range, permits us (i) to observe six double ionization fragmentation channels, their relative yields being accounted for about two-thirds by the couple (C2H4+, CH2O+) and one-fifth by (C2H3+, CH3O+); (ii) to measure thresholds for their openings as a function of photon energy; and (iii) to unravel a pronounced bimodality for a kinetic-energy-released distribution, fingerprint of competitive non-adiabatic mechanisms.
Article 1 Read 2 Citations Single Photon Thermal Ionization of C60 Klavs Hansen, Robert Richter, Michele Alagia, Stefano Strang... Published: 08 March 2017
Physical Review Letters, doi: 10.1103/PhysRevLett.118.103001
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We report on experiments which show that C60 can ionize in an indirect, quasithermal boiloff process after absorption of a single photon. The process involves a large number of incoherently excited valence electrons and yields electron spectra with a Boltzmann distribution with temperatures exceeding 104 K. It is expected to be present for other molecules and clusters with a comparatively large number of valence electrons. The astrophysical consequences are briefly discussed. DOI:https://doi.org/10.1103/PhysRevLett.118.103001 © 2017 American Physical Society
Article 0 Reads 5 Citations The escape of O+ ions from the atmosphere: An explanation of the observed ion density profiles on Mars Stefano Falcinelli, Michele Alagia, Luca Schio, Stefano Stra... Published: 01 December 2016
Chemical Physics Letters, doi: 10.1016/j.cplett.2016.09.003
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Article 2 Reads 3 Citations Angular and energy distributions of fragment ions in dissociative double photoionization of acetylene molecules in the 3... Stefano Falcinelli, Michele Alagia, James M. Farrar, Konstan... Published: 21 September 2016
The Journal of Chemical Physics, doi: 10.1063/1.4962915
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The two-body dissociation reactions of the dication C2H2 +2, initiated via double ionization of acetylene molecules by photons in the energy range 31.9-50.0 eV, have been studied by coupling photoelectron-photoion-photoion coincidence and ion imaging techniques. The angular distributions and kinetic energy of product ions, measured in the 31.9-50.0 eV energy range, exhibit significant differences for the three leading dissociation reactions with respect to a previous investigation carried out at a fixed energy of 39.0 eV, providing thus new information on the dynamical evolution of the system. The analysis of the results indicates that such dissociation reactions occur with a different mechanism. In particular, the symmetric dissociation in two CH+ ions is characterized by different dynamics, and the anisotropy of the angular distribution of ionic products increases with photon energy in a more pronounced way than the other two reactions. Moreover, the kinetic energy distribution of the symmetric dissociation reaction exhibits several components that change with photon energy. The new experimental findings cast light on the microscopic evolution of the system and can provide a laboratory reference for new theoretical calculations on specific features of the multidimensional potential energy surface, namely, the structure, energy and symmetry of dication states, the electronic state of dissociation products, energy barriers and their dependence on the geometry of the intermediate state.
Article 2 Reads 4 Citations Molecular Dications in Planetary Atmospheric Escape Stefano Falcinelli, Fernando Pirani, Michele Alagia, Luca Sc... Published: 26 August 2016
Atmosphere, doi: 10.3390/atmos7090112
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Fundamental properties of multiply charged molecular ions, such as energetics, structure, stability, lifetime and fragmentation dynamics, are relevant to understand and model the behavior of gaseous plasmas as well as ionosphere and astrophysical environments. Experimental determinations of the Kinetic Energy Released (KER) for ions originating from dissociations reactions, induced by Coulomb explosion of doubly charged molecular ions (molecular dications) produced by double photoionization of CO2, N2O and C2H2 molecules of interest in planetary atmospheres, are reported. The KER measurement as a function of the ultraviolet (UV) photon energy in the range of 28–65 eV was extracted from the electron-ion-ion coincidence spectra obtained by using tunable synchrotron radiation coupled with ion imaging techniques at the ELETTRA Synchrotron Light Laboratory Trieste, Italy. These experiments, coupled with a computational analysis based on a Monte Carlo trajectory simulation, allow assessing the probability of escape for simple ionic species in the upper atmosphere of Mars, Venus and Titan. The measured KER in the case of H+, C+, CH+, CH2+, N+, O+, CO+, N2+ and NO+ fragment ions range between 1.0 and 5.5 eV, being large enough to allow these ionic species to participate in the atmospheric escape from such planets into space. In the case of Mars, we suggest a possible explanation for the observed behavior of the O+ and CO22+ ion density profiles.
Conference 5 Reads 0 Citations The Role of Molecular Dications in Planetary Atmospheric Escape Stefano Falcinelli, Fernando Pirani, Michele Alagia, Luca Sc... Published: 16 July 2016
The 1st International Electronic Conference on Atmospheric Sciences, doi: 10.3390/ecas2016-b004
DOI See at publisher website