Höfer U, Shumay I, Reuss C, Thomann U, Fauster T (1998)
Publication Status: Published
Publication Type: Journal article
Publication year: 1998
Publisher: International Society for Optical Engineering; 1999
Book Volume: 3272
Pages Range: 211-220
DOI: 10.1117/12.307124
The ultrafast dynamics of electrons in image-potential states on a Cu(100) surface is studied by means of femtosecond time-resolved two-photon photoemission (2PPE). By coherently exciting several eigenstates of the Rydberg series we observe periodic oscillations of the 2PPE signal as a function of the delay time between pump and probe pulses. These quantum beats allow us to determine the spacing of high-order states (quantum number n greater than or equal to 4) that are difficult to resolve by conventional electron spectroscopy. The superposition of several states around n = 7 creates an electron wave packet that describes the quasi-classical periodic motion of weakly bound electrons. Its distance from the surface is reflected in the strength of the photoemission signal. The electron is observed to move about 100 atomic distances away from the surface and oscillates back and forth with a period of 800 femtoseconds. The results demonstrate the power of coherent laser spectroscopy for surface studies.
APA:
Höfer, U., Shumay, I., Reuss, C., Thomann, U., & Fauster, T. (1998). Wave-packet excitation and quantum-beat spectroscopy of image-potential states. Proceedings of SPIE, 3272, 211-220. https://dx.doi.org/10.1117/12.307124
MLA:
Höfer, Ulrich, et al. "Wave-packet excitation and quantum-beat spectroscopy of image-potential states." Proceedings of SPIE 3272 (1998): 211-220.
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