The Adsorbate Electron Affinity Dependence of Femtosecond Electron Dynamics at Dielectric/Metal Interfaces

The two pho ton photoemission tech nique has been uti lized to in ves ti gate the ad sor bate elec tron af fin ity de pend ence of in ter fa cial elec tron trans fer dy nam ics. The com par i son of cal cu lated and ex per i men tal re sults high light a brief dis cus sion of a di elec tric con tin uum model. For the n-heptane/Ag(111) and the ben zene/ Ag(111) in ter faces, the model ef fec tively re pro duces ex per i men tal im age po ten tial state prop er ties. The model fails to ad e quately de scribe the in flu ence of anthracene ad sor bates on im age po ten tial state life times, as dem on strated by the ex per i men tal and the o ret i cal re sults. The ex per i mental n = 1 life time of 1200 femto seconds and bind ing en ergy of -0.53 eV for the anthracene bilayer dif fer greatly from the cal cu lated val ues of 40 femto seconds and -1.4 eV.