Numéro
J. Phys. IV France
Volume 03, Numéro C6, Novembre 1993
International Symposium on (e,2e) Collisions, Double Photoionization and Related Processes
(e,2e) '93
Page(s) C6-217 - C6-226
DOI http://dx.doi.org/10.1051/jp4:1993621
International Symposium on (e,2e) Collisions, Double Photoionization and Related Processes
(e,2e) '93

J. Phys. IV France 03 (1993) C6-217-C6-226

DOI: 10.1051/jp4:1993621

First observation of a Fano profile following one step autoionization into a double photoionization continuum

L. JOURNEL1, B. ROUVELLOU1, D. CUBAYNES1, J.M. BIZAU1, F.J. WUILLEUMIER1, M. RICHTER2, P. SLADECZEK2, K.-H. SELBMANN2, P. ZIMMERMANN2 and H. BERGERON3

1  Laboratoire de Spectroscopie Atomique et Ionique, Université Paris Sud, URA 775 du CNRS, B. 350, 91405 Orsay, France
2  Technische Universität, Berlin, Germany
3  LURE, CNRS-CEA-MEN, Université Paris Sud, B. 209d, 91405 Orsay, France


Abstract
We have measured the double photoionization cross section of sodium atoms between the first 2s22p5 2P double photoionization (52.4 eV) and 2s-single 1.3S photoionization thresholds (71.0 eV). We have also observed a Fano profile into the double ionization continuum resulting from the interference between the one-step direct double photoionization process and the resonant double Auger decay of core-excited neutral sodium in the 2s → 3p resonance region. Profiles of absolute partial and total cross sections have been obtained in all important channels. The Fano and Starace parameters, in particular a width of 0.23 eV, have been determined, allowing full characterization of the resonance.



© EDP Sciences 1993