Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 42: Symposium Electron transfer processes II

O 42.5: Fachvortrag

Donnerstag, 30. März 2006, 17:00–17:30, WIL C207

Non-adiabatic Surface Dynamics: Electron Transfer and Femtochemistry at the Adsorbate/Metal Interface — •Martin Wolf — Dept. of Physics, Freie Universität Berlin, 14195 Berlin, Germany

One of the key goals in surface physics is to obtain a microscopic understanding of elementary excitations in surface reaction dynamics. At metals the dynamics of gas surface interactions are governed by ultrafast charge and energy transfer to the substrate, leading to non-adiabatic couplings between electronic and nuclear degrees of freedom. As a consequence electronic excitation of the substrate by ultrafast laser pulses can induce efficiently non-thermal reactions of adsorbed species. In this talk we present recent progress in the application of femtosecond time-resolved laser spectroscopy to investigate electron thermalization dynamics in metals, electron transfer at the adsorbate metal interface as well as surface femtochemistry induced by photoexcited hot electrons. We show that time-resolved photoemission spectroscopy allows to analyze directly the transient non-equilibrium electron distribution in Ru(001) and discuss the role of electronic friction and energy partitioning between various degrees of freedom in the associative formation of hydrogen and CO on Ru(001).