Abstract
The electron-energy distribution in a gold film was measured with ∼700 fs time-resolved photoemission spectroscopy following laser heating by a 400 fs visible laser pulse. The measured distribution can be fitted by the Fermi-Dirac function at an elevated temperature except within 800 fs of the heating pulse (time-resolution limited), when a reproducible departure is observed. As a result, the relaxation of nonequilibrium electrons was found to be inadequately described by the standard electron-phonon coupling model.
- Received 6 September 1991
DOI:https://doi.org/10.1103/PhysRevLett.68.2834
©1992 American Physical Society