Near-threshold photoelectron angular distributions from two-photon resonant photoionization of He (Articolo in rivista)

Type
Label
  • Near-threshold photoelectron angular distributions from two-photon resonant photoionization of He (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1367-2630/15/1/013023 (literal)
Alternative label
  • O'Keeffe, P ; Mihelic, A ; Bolognesi, P ; Zitnik, M ; Moise, A ; Richter, R ; Avaldi, L (2013)
    Near-threshold photoelectron angular distributions from two-photon resonant photoionization of He
    in New journal of physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • O'Keeffe, P ; Mihelic, A ; Bolognesi, P ; Zitnik, M ; Moise, A ; Richter, R ; Avaldi, L (literal)
Pagina inizio
  • 013023 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://iopscience.iop.org/1367-2630/15/1/013023/ (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 15 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • [ 1 ] CNR IMIP, Area Ric Roma 1, Monterotondo, Italy [ 2 ] Jozef Stefan Inst, SI-1000 Ljubljana, Slovenia [ 3 ] Univ Ljubljana, Fac Math & Phys, SI-1000 Ljubljana, Slovenia [ 4 ] Sincrotrone Trieste SCpA, I-34149 Trieste, Italy (literal)
Titolo
  • Near-threshold photoelectron angular distributions from two-photon resonant photoionization of He (literal)
Abstract
  • Two-photon resonant photoionization of helium is investigated both experimentally and theoretically. Ground state helium atoms are excited to the 1s4p, 1s5p and 1s6p P-1 states by synchrotron radiation and ionized by a synchronized infrared pulsed picosecond laser. The photoelectron angular distributions of the emitted electrons are measured using a velocity map imaging (VMI) spectrometer. The measured asymmetry parameters of the angular distribution allow the phase differences and the ratios of the dipole matrix elements of the 1s epsilon s and 1s epsilon d channels to be determined. The experimental results agree with the calculated values obtained in a configuration-interaction calculation with a Coulomb-Sturmian basis set. The effects of the radiative decay of the intermediate state and the static electric field of the VMI spectrometer on the measurements are discussed. (literal)
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