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Science 5 September 1997:
Vol. 277. no. 5331, pp. 1480 - 1482
DOI: 10.1126/science.277.5331.1480
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Reports

Time-Resolved Coherent Photoelectron Spectroscopy of Quantized Electronic States on Metal Surfaces

U. Höfer, * I. L. Shumay, Ch. Reuß, U. Thomann, W. Wallauer, Th. Fauster

Time-resolved two-photon photoemission in combination with the coherent excitation of several quantum states was used to study the ultrafast electron dynamics of image-potential states on metal surfaces. For a (100) surface of copper, the spectroscopy of quantum beats made previously unresolved high-order states (quantum number n >= 4) experimentally accessible. By exciting electrons close to the vacuum level, electron wave packets could be created and detected that described the quasi-classical periodic motion of weakly bound electrons. They traveled more than 200 Å away from the surface and oscillated back and forth with a period of 800 femtoseconds.

U. Höfer and I. L. Shumay, Max-Planck-Institut für Quantenoptik, D-85740 Garching, Germany.
Ch. Reuß, U. Thomann, W. Wallauer, Th. Fauster, Max-Planck-Institut für Plasmaphysik, D-85740 Garching, and Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany.
*   To whom correspondence should be addressed.

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