RESULTS AND DISCUSSION
In Figure 4a, the extinction efficiency (Qext) in dependence on
ì for particle diameters between 2.5 and 100 nm is shown. The
surface plasmon resonance (spr) is clearly visible as a peak in
the range between 520 and 580 nm. For small particles this peak
is damped due to the reduced mean free path of the electrons.
This gets clearer in Figure 4b, where the mean free path corrected
results for a particle diameter of 20.4 nm (dotted line) are
compared to calculations where no correction was applied (dashed
line).