Femtosecond Dynamics of Electrons on surfaces and atinterfaces
Two-photon photoemission is a promising new technique that has been developed for the study of electron dynamics at interfaces. A femtosecond laser is used to both create an excited electronic distribution at the surface and eject the distribution for subsequent energy analysis. Time- and momentum-resolved two-photon photoemission spectra as a function of layer thickness fully determine the conduction band dynamics at the interface. Earlier clean surface studies showed how excited electron lifetimes are affected by the crystal band structure and vacuum image potential. Recent studies of various insulator/metal interfaces show that the dynamics of excess electrons are largely determined by the electron affinity of the adsorbate. In general, electron dynamics at the interface are influenced by the substrate and adlayer band structures, dielectric screening, and polaron formation in the two-dimensional overlayer lattice.
- Research Organization:
- Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
- Sponsoring Organization:
- USDOE Director, Office of Energy Research
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 899170
- Report Number(s):
- LBNL--40220
- Journal Information:
- Annual Review of Physical Chemistry, Journal Name: Annual Review of Physical Chemistry Vol. 48
- Country of Publication:
- United States
- Language:
- English
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