Long-lived excited states at surfaces: Cs/Cu(111) and Cs/Cu(100) systems.
One-electron and multielectron contributions to the decay of transient states in the Cs/Cu(111) and (100) systems are studied by a joined wave-packet propagation and many-body metal response approach. The long lifetime of these states is due to the Cu L and X band gaps which reduce the electron tunneling between Cs and Cu. In the (111) case, the decay is mainly by inelastic e-e interaction, whereas in the (100) case, electron tunneling is dominating. This accounts very well for the experimental findings [Bauer et al., Phys. Rev. B 55, 10 040 (1997) and Ogawa et al., Phys. Rev. Lett. 82, 1931 (1999)].
Borisov
A G
AG
Laboratoire des Collisions Atomiques et Moléculaires, Unité Mixte de Recherche CNRS-Université Paris Sud UMR 8625, Bâtiment 351, Université Paris-Sud, 91405 Orsay Cedex, France.
Gauyacq
J P
JP
Kazansky
A K
AK
Chulkov
E V
EV
Silkin
V M
VM
Echenique
P M
PM