Angular distributions of molecular Auger electrons: The case of C 1s Auger emission in CO

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.75.032707· OSTI ID:20982327

Semenov, S K; Kuznetsov, V V; Cherepkov, N A ^[1]; Bolognesi, P ^[2]; Feyer, V ^[2]; Lahmam-Bennani, A; Casagrande, M E. Staicu ^[3]; Avaldi, L ^[2]

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1. State University of Aerospace Instrumentation, 190000, St. Petersburg (Russian Federation)
2. CNR-IMIP, Area della Ricerca di Roma 1, CP 10, 00016 Monterotondo Scalo (Italy)
3. LCAM, Bat 351 Universite Paris-Sud XI, F-91405 Orsay Cedex (France)

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 degree sign , 30 degree sign , and 60 degree sign . 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.

• OSTI ID: 20982327
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 75; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR CORRELATION
ANGULAR DISTRIBUTION
AUGER ELECTRON SPECTROSCOPY
CARBON OXIDES
DECAY
ELECTRONS
EMISSION
EV RANGE 100-1000
HARTREE-FOCK METHOD
IONIZATION
MOLECULES
PARTIAL WAVES
PHOTOELECTRON SPECTROSCOPY
PHOTON-MOLECULE COLLISIONS
PHOTONS
POLARIZATION
WAVE FUNCTIONS