Abstract
The electron energy distribution in supported Ag nanoparticles is measured using multiphoton photoemission. The variation of the photoemission spectrum with temperature allows us to measure the electron gas temperature inthe particles. Time-resolved photoemission reveals an electron gas cooling rate of about 0.7 ps - 1 that varies little with size (1.5-4.5 nm) and is reduced by a factor of about 2 in comparison to bulk Ag and embedded nanoparticles. The modified relaxation behavior for supported nanoparticles is attributed to the different role of excited electron transfer.
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