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Dipole and non-dipole allowed inner-shell excitation of molecules studied by coincidence electron impact experiments (Articolo in rivista)

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Dipole and non-dipole allowed inner-shell excitation of molecules studied by coincidence electron impact experiments (Articolo in rivista) (literal)

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Feyer V. , P. Bolognesi, M. Coreno, K.C. Prince, L. Avaldi, B. Jansik and V. Carravetta (2007)
Dipole and non-dipole allowed inner-shell excitation of molecules studied by coincidence electron impact experiments
in Journal of electron spectroscopy and related phenomena (Print)
(literal)

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Feyer V. , P. Bolognesi, M. Coreno, K.C. Prince, L. Avaldi, B. Jansik and V. Carravetta (literal)

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1) CNR-IMIP, Area della Ricerca di Roma 1,CP 10, 00016 Monterotondo Scalo, Italy 2) CNR-IPCF, Area della Ricerca di Pisa, via Moruzzi 1, 56124 Pisa 3) Institute of Electron Physics, National Academy of Sciences, Uzhgorod, Ukraine 4) INFM-TASC, Gasphase beamline@Elettra, Area Science Park, 34012 Basovizza, Trieste, Italy 5) Sincrotrone Trieste, Area Science Park, 34012 Basovizza, Trieste, Italy 6) CNR-IPCF, Area della Ricerca di Pisa, Italy (literal)

Titolo

Dipole and non-dipole allowed inner-shell excitation of molecules studied by coincidence electron impact experiments (literal)

Abstract

Electron-impact ionization and excitation at different incident energies of the electron beam have been used successfully to study inner shell excited states of atoms and molecules. An important advantage of electron excitation is the ability to investigate electric-dipole forbidden transitions at low incident energy. In this work we have performed an investigation of the decay of the CO (1s->pi*, siglet and triplet) and N2 (1s->pi*, siglet and triplet) excited states in experiments where both the scattered and ejected electrons are detected in coincidence. The measurements have been done with the multicoincidence end-station of the Gas Phase beamline at Elettra, equipped with an electron gun. In the present arrangement both the inelastically scattered and the Auger electrons were detected at 90. with respect to the direction of the incident beam. The incident energy used in the experiment was 600 eV. In the coincidence experiments the spectra due to the singlet and triplet excitations were directly separated. The CO results have been compared with an ab-initio multiconfiguration and multicenter calculation. The calculation shows that the differences in the potential energy curves of the two inner shell excited states as well as the population of final CO+ quartet states in the decay of the triplet core excited state explain the difference observed in the experimental spectra. (literal)

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