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- W1656553079 abstract "Many processes at surfaces, from chemical reactions to electron transfer, involve the creation and decay of electronically excited states. At metal surfaces, the density of electrons is high, leading to strong interactions and fast electron scattering. As a result, electronic excitations at metal surfaces are extremely short-lived. Surface imperfections and defects, which are always present on real surfaces, often influence or even determine these lifetimes and thus complicate the interpretation of experimental data. On page 1399 of this issue, Kliewer et al. (1) overcome this obstacle using the unique capabilities of the scanning tunneling microscope (STM). They select a large area on a single-crystal surface in which the atoms are perfectly ordered and probe the response of the electron gas to a well-defined electronic excitation confined to the topmost layers of the crystal (see the figure). On page 1402, Petek et al. present another twist to this line of investigation (2). They use ultrashort laser pulses to induce a transfer of electrons from the underlying metal to cesium atoms adsorbed on a copper surface, which results in a stretching of the Cs-metal bond. Using time-resolved photoemission spectroscopy (3), Petek et al. record a real-time “movie” of the Cs atom motion." @default.
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- W1656553079 date "2000-05-26" @default.
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- W1656553079 title "Electron Dynamics at Surfaces" @default.
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- W1656553079 doi "https://doi.org/10.1126/science.288.5470.1352" @default.
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