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Double photoionization of He at 80 ev excess energy in the equal-energy sharing condition (Articolo in rivista)

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Double photoionization of He at 80 ev excess energy in the equal-energy sharing condition (Articolo in rivista) (literal)

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Turri G. (1,2) , Avaldi L. (3), Bolognesi P.(3), Camilloni R. (3), Coreno M. (2), Berakdar J.(4), Kheifets A.S.(5), Stefani G.(6) (2002)
Double photoionization of He at 80 ev excess energy in the equal-energy sharing condition
in Physical review. A
(literal)

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Turri G. (1,2) , Avaldi L. (3), Bolognesi P.(3), Camilloni R. (3), Coreno M. (2), Berakdar J.(4), Kheifets A.S.(5), Stefani G.(6) (literal)

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(1) Dipartimento di Fisica, Politecnico di Milano, Milano, Italy (2) INFM, Laboratorio TASC, Area Science Park, Basovizza, Trieste, Italy (3) CNR-IMAI, Area della Ricerca di Roma, Casella Postale 10, 00016 Monterotondo Scalo, Italy (4) Max Planck Institut fu¨r Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany (5) Research School of Physical Science and Engineering, Australian National University, Canberra, Australian Capital Territory 2000, Australia (6) Dipartimento di Fisica ''E. Amaldi'' and INFM Unita` di Roma III, Universita` di Roma Tre, Via della Vasca Navale, Roma, Italy (literal)

Titolo

Double photoionization of He at 80 ev excess energy in the equal-energy sharing condition (literal)

Abstract

The high flux of the gas-phase beamline at the Elettra storage ring, Trieste (Italy), and the efficiency of a multicoincidence end station have been combined to measure the triple-differential cross section (TDCS) for the double photoionization (DPI) of He at excess energies E = 20 and 80 eV. The TDCS has been measured in the equal-energy-sharing kinematics, in which the kinetic energies of the two photoelectrons are equal (E1 = E2 = E/2). The experiments are compared with the predictions of a many-body Coulomb wave method and a convergent close-coupling calculation. The symmetrized gerade amplitudes of the He (DPI) extracted by the experiments as well as by the two calculations have been fitted by a Gaussian function. The results support the validity of the parametrization of the gerade amplitude via only one parameter, the full width at half maximum 1/2, of the Gaussian function, up to 80 eV above threshold. (literal)

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