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Angular distribution of molecular Auger electrons : the case of C1s Auger emission in CO (Articolo in rivista)

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Angular distribution of molecular Auger electrons : the case of C1s Auger emission in CO (Articolo in rivista) (literal)

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S.K. Semenov1, V.V. Kuznetsov1, N.A. Cherepkov1, P. Bolognesi2 , V. Feyer2,3 , A. Lahmam-Bennani4, M.E. Staicu Casagrande4, and L. Avaldi2,5 (2007)
Angular distribution of molecular Auger electrons : the case of C1s Auger emission in CO
in Physical review. A
(literal)

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S.K. Semenov1, V.V. Kuznetsov1, N.A. Cherepkov1, P. Bolognesi2 , V. Feyer2,3 , A. Lahmam-Bennani4, M.E. Staicu Casagrande4, and L. Avaldi2,5 (literal)

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1State University of Aerospace Instrumentation, 190000, St. Petersburg, Russia 2CNR-IMIP, Area della Ricerca di Roma 1, CP 10, 00016 Monterotondo Scalo, Italy 3Institute of Electron Physics, National Academy of Sciences, Uzhgorod, Ukraine 4LCAM, Bat 351 Universite Paris-Sud XI, F-91405 Orsay Cedex, France 5CNR-INFM-TASC, Gasphase beamline@Elettra, Area Science Park, 34012 Basovizza, Trieste, Italy (literal)

Titolo

Angular distribution of molecular Auger electrons : the case of C1s Auger emission in CO (literal)

Abstract

The results of a study of the Auger-electron-photoelectron angular correlations in the case of the C 1s ionization of the CO molecule are presented and compared with theoretical calculations in the Hartree-Fock approximation based on the two-step model. The measurements have been performed at two photon energies, 305 and 318 eV, respectively, and at three angles of photoelectron emission relative to the light polarization vector: namely, 0°, 30°, and 60°. A general agreement is found between theory and experiment for the coincidence angular distributions and the relative magnitudes of the Auger-electron-photoelectron angular correlations. However, both experiment and theory show that the Auger-electron-photoelectron angular correlations are not sufficiently sensitive to the details of the Auger-electron wave function to allow a \"complete\" Auger experiment in molecules. On the other hand, our calculations demonstrate that the Auger-electron angular distribution measured in the molecular frame is very sensitive to the individual contributions of different partial waves of the Auger electron. Therefore we conclude that the complete experiment for the Auger decay in molecules can be realized only measuring the Auger-electron angular distributions in the molecular frame. (literal)

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