  Time-resolved ultrafast x-ray scattering is an emerging approach to probe the
temporally evolving electronic charge distribution in real-space and in
real-time. In this contribution, time-resolved ultrafast x-ray scattering from
an electronic wave packet is presented. It is shown that the spatial and
temporal correlations are imprinted in the scattering patterns, obtained by
ultrafast x-ray scattering from an electronic wave packet, which deviate
drastically from the notion that the instantaneous electronic density is the
key quantity being probed. Furthermore, a detailed analysis of ultrafast x-ray
scattering from a sample containing a mixture of non-stationary and stationary
electrons along with the role of scattering interference between a
non-stationary and several stationary electrons to the total scattering signal
is discussed.
