TOWARDS A NEW (Q, T) REGIME BY TIME-RESOLVED X-RAY-DIFFRACTION - ULTRA-SOUND EXCITED CRYSTALS AS AN EXAMPLE

Time-resolved diffraction patterns down to a sub-nanosecond scale obta ined with a high-resolution diffractometer for high-energies X-rays on ultrasonically excited samples are presented. The time resolution giv es direct insight into the purity of the excited sound waves and revea ls the density of states for the lattice parameter at any point of tim e in a MHz oscillation period. The combination of the time resolution with the momentum transfer Q accessible by the high-energy diffractome ter gives access to a unique regime in (Q, t) space.