a Kirchhoff-Institut für Physik, Universität Heidelberg, Germany b Institut für Physik der kondensierten Materie, Universität Düsseldorf, Germany c LURE, Centre Universitaire Paris Sud, Paris
Abstract:
The common basis of the observations made with the four experimental methods is the transient electron transfer from the metal to the lowest unoccupied electronic states of the adsorbed molecules.