Photon-Stimulated Desorption due to Multielectron Excitations in Chemisorbed Molecules: CO on Ni(100)

R. Jaeger; J. Stöhr; R. Treichler; K. Baberschke

doi:10.1103/PhysRevLett.47.1300

Photon-Stimulated Desorption due to Multielectron Excitations in Chemisorbed Molecules: CO on Ni(100)

R. Jaeger, J. Stöhr, R. Treichler, and K. Baberschke

Phys. Rev. Lett. 47, 1300 – Published 2 November 1981

Abstract

The $O^{+}$ ion yield above the $O (1 s)$ absorption threshold ( $K$ edge) from CO on Ni(100) is found to deviate significantly from the absorption coefficient. It exhibits a delayed onset by more than 20 eV with a broad maximum more than 100 eV above the threshold. This indicates the dominance of multielectron excitations over Auger deexcitation as the bond-breaking step for $O^{+}$ desorption from chemisorbed CO molecules. Fine structure in the $O^{+}$ yield around 50 eV above threshold is assigned to a resonant shake-off process.

Received 8 June 1981

DOI:https://doi.org/10.1103/PhysRevLett.47.1300

Authors & Affiliations

R. Jaeger, J. Stöhr^*, R. Treichler^†, and K. Baberschke^‡

Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305

^*Present address: Exxon Research and Engineering Co., P. O. Box 45, Linden, N. J. 07036.
^†Permanent address: Physik-Department, Technische Universität München, D-8046 Garching, West Germany.
^‡Permanent address: Institut für Atom- und Festkorperphysik, Freie Universität Berlin, D-1000 Berlin 33, West Germany.