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Dynamics of photoexcited electrons in metals studied with time-resolved two-photon photoemission

MPS-Authors
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Knoesel,  Ernst
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Hotzel,  Arthur
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Hertel,  Tobias
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ertl,  Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Knoesel, E., Hotzel, A., Hertel, T., Wolf, M., & Ertl, G. (1996). Dynamics of photoexcited electrons in metals studied with time-resolved two-photon photoemission. Surface Science, 368(1-3), 76-81. doi:10.1016/S0039-6028(96)01032-1.


Cite as: https://hdl.handle.net/21.11116/0000-0009-B442-1
Abstract
Femtosecond time-resolved two-photon photoemission (2PPE) is used to investigate the hot electron dynamics of Cu(111), Ag(110) and Ta(poly). The experimentally derived relaxation rates of photoexcited electrons scale with the available phase space for scattering with electrons below the Fermi level and are compared with predictions from Fermi liquid theory. A simulation employing rate equations to account for hot electron lifetimes, transport effects and the creation of secondary electrons demonstrates that the relaxation dynamics is strongly influenced by secondary electron cascades. With Ag(110) a pronounced temperature dependence of the photoemission yield is observed, indicating the importance of electron-phonon scattering for momentum conservation in the 2PPE process.