By Michael Leitner
Diffusion in solids at reasonable temperatures is a widely known phenomenon. even if, direct experimental proof concerning the accountable atomic-scale mechanisms has been scarce, as a result of problems in probing the proper size- and time-scales. the current thesis bargains with the applying of X-ray Photon Correlation Spectroscopy (XPCS) for answering such questions. this can be a longtime strategy for the examine of sluggish dynamics on length-scales of some nanometres. The scattered depth within the diffuse regime, i.e. resembling atomic distances, is especially low, besides the fact that, and so it has up to now been thought of most unlikely to exploit XPCS for this problem.
Threefold development is stated during this paintings: It proposes a few platforms chosen for top diffuse depth, it optimizes the photon detection and knowledge overview strategies, and it establishes theoretical versions for interpretating the consequences. jointly those advances allowed the 1st winning atomic-scale XPCS test, which elucidated the position of hottest configurations for atomic jumps in a copper-gold alloy.
The progress in on hand coherent X-ray depth including next-generation X-ray resources will open up a large box of software for this new method.