Fig. 6

Changes in carrier population for the Kretschmann configuration. a Spectrum cuts of Δf(E), inferred from the second integral Eq. (4), at t = 136, 163, 400 fs. The relatively broad initial electron energy distribution change at the earlier time (136 fs) evolves to a narrower and larger magnitude Fermi–Dirac distribution at later time (400 fs). b Same as a but with multiplication factors in order to better compare the various time functional forms