Physical Review B
The energy-dependent relaxation of photoexcited electrons has been measured by time-resolved two-photon photoemission spectroscopy on single-crystal Au(111) films with thickness ranging from 150 to 3000 Å. It is found that the energy-dependent relaxation does not show any significant thickness dependence, which indicates that electron transport is a much slower dynamical process in the near-surface region than expected from bulk properties. Furthermore, lifetimes of the photoexcited electrons can be fitted well by the Fermi-liquid theory with a scaling factor plus an effective upper lifetime. This observation enables separation of electron-electron scattering, and to a lesser extent electron-phonon scattering, processes from electron-transport effects on the surface dynamics. ©1998 American Physical Society
Original Publication Citation
Cao, J., Gao, Y., Elsayed-Ali, H. E., Miller, R. J. D., & Mantell, D. A. (1998). Femtosecond photoemission study of ultrafast electron dynamics in single-crystal Au(111) films. Physical Review B, 58(16), 10948-10952. doi:10.1103/PhysRevB.58.10948
Cao, J.; Gao, Y.; Elsayed-Ali, H. E.; Miller, R. J. D.; and Mantell, D. A., "Femtosecond Photoemission Study of Ultrafast Electron Dynamics in Single-Crystal Au(111) Films" (1998). Electrical & Computer Engineering Faculty Publications. 120.