Abstract
Femtosecond spectroscopy has been largely exploited in metal films to investigate electron interaction processes, with a special emphasis on the internal and/or external electron gas thermalization due to electron-electron and electron-phonon scattering.1,2 The interplay between these processes for strongly nonequilibrium distributions has been evoked3,4 but not directly demonstrated. We have investigated this effect using a femtosecond pumpprobe technique with 20-fs pulses.
© 1998 Optical Society of America
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