International Conference on Coincidence Spectroscopy

J. Phys. IV France 09 (1999) Pr6-161-Pr6-164
DOI: 10.1051/jp4:1999636

Angular correlation in Auger photoelectron coincidence spectroscopy from the Cu(111) surface

R. Gotter¹, A. Attili², A. Ruocco², D. Arena³, R.A. Bartynski³, S. Iacobucci⁴, L. Marassi⁵, P. Luches⁵, D. Cvetko¹, L. Floreano¹, A. Morgante¹, F. Tommasini¹ and G. Stefani<sup>2

1</sup>  Unità INFM di Roma Tre e Dipartimento di Fisica E. Amaldi, Università di Roma Tre, Roma, Italy
²  Laboratorio Nazionale TASC-INFM, Trieste, Italy
³  Unità INFM di Modena e Dipartimento di Fisica, Università di Modena, Modena, Italy
⁴  Istituto Metodologie Avanzate Inorganiche, CNR, Montelibretti, Italy
⁵  Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, U.S.A.

Abstract
The feasibility of angle resolved APECS (Auger Photo-Electron Coincidence Spectroscopy)on solids is demonstrated with an experiment performed at the ALOISA (ELETTRA, Trieste) beamline on the L₃M₄₅M₄₅ Auger transition of the Cu(111) surface. This beamline,with its multicoincidence detection system based on several individual electron analysers, was designed in order to perform such experiment with good efficiency. The correlation effects displayed by the measured angular distribution are not explained by the two step model, that conversely is commonly accepted for non coincidence experiments performed at the same energy and on the same orbital.

© EDP Sciences 1999