Time-resolved two-color interferometric photoemission of image-potential states on Cu(100) |
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Authors: | J. Güdde M. Rohleder U. Höfer |
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Affiliation: | 1. Fachbereich Physik und Zentrum für Materialwissenschaften, Philipps-Universit?t, 35032, Marburg, Germany
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Abstract: | We describe an interferometric time-resolved photoemission technique that makes it possible to simultaneously observe the decay of optical induced polarizations and populations at surfaces in a two-color excitation scheme. In this scheme initially unoccupied electronic surface states are coherently excited by the interaction of laser pulses with frequency ωa and the two-photon polarization which is induced by laser pulses with frequency ωa/2. Interference is observed by changing the delay between both laser pulses using an actively stabilized two-color Mach–Zehnder interferometer. We demonstrate this technique for excitation of the n=1 image-potential state on a Cu(100) surface. PACS 78.47.+p; 79.60.Bm; 73.20.-r; 82.53.Kp; 42.50.Md |
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