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

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Science  05 Sep 1997:
Vol. 277, Issue 5331, pp. 1480-1482
DOI: 10.1126/science.277.5331.1480

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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 numbern ≥ 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.

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