  We present results of electronic Raman-scattering experiments in differently
doped Y-123. In B2g symmetry, an analysis of the data in terms of a memory
function approach is presented and dynamical relaxation rates
$\Gamma(\omega,T)$ and mass-enhancement factors $1+\lambda(\omega,T)$ for the
carriers are obtained. Starting from temperatures T > 180K, $\Gamma(\omega,T)$
and $1+\lambda(\omega,T)$ are extrapolated to lower temperatures and used to
re-calculate Raman spectra. By comparison with our data, we find a loss of
spectral weight between Tc < T < T* at all doping levels x. T* is comparable to
the pseudogap temperature found in other experiments. Below Tc, the
superconducting gap is observed. It depends on x and scales with Tc whereas the
energy scale of the pseudogap remains the same.
