Abstract
to \valunit{500}{nm} have been measured by femtosecond time-resolved pump-probe experiments. A conspicuous change of the relaxation behavior was found around \valunit{100}{nm} for pump pulse fluences of \valunit{1}{mJ/cm^{2}} . Thicker films show a nearly exponential decay of the transient linear reflectivity, which turns into a linear decay during the first \rangeunit{5}{7}{ps} for films with thicknesses of \valunit{100}{nm} or less. This observation is evidence of a mean free path of about \valunit{100}{nm} for hot electrons with temperatures around \valunit{1500}{K} .
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