Abstract Details
| Coherent X-ray Surface Diffraction: Speckle from Single Atomic Layers of Gold | |
|---|---|
| Abstract ID | W_Coherent-6 |
| Presenter | Michael S Pierce |
| Presentation Type | Coherent X-ray - LCLS |
| Full Author List | Michael S. Pierce (1) , Kee-Chul Chang (1) , Dan Hennessy (1) , Vlado Komanicky (1,3) , Alec Sandy (2) , Michael Sprung (2) , Hoydoo You (1) |
| Affiliations | (1) Materials Science Division, Argonne National Laboratory (2) Advanced Photon Source, Argonne National Laboratory (3) Slovak Academy of Science Koice, Slovakia |
| Category | Materials Science |
| Abstract | We present preliminary results of the first coherent x-ray diffraction from an atomic monolayer surface reconstruction. Speckled scattering patterns were successfully collected from ordered surface atoms on Au (001) crystals in high vacuum. We have collected data at both the forbidden (001) anti-Bragg point as well as limited coherent scattering data directly from the surface reconstruction. At high temperatures, the system appears to be in meta-stable equilibrium. After a temperature change the average surface populations of reconstructed vs. non-reconstructed surface relaxes to a constant for a given temperature, but the speckles continue to evolve within the collected scattering patterns. Above 84°C the rate of speckle decorrelation rapidly increases for very small changes in temperature. Below this point, the speckles decorrelate at much slower rates. Signal to noise makes this a difficult experiment with 3rd generation light sources, however we expect this technique to become easier and more broadly applicable with FEL sources. |
| Footnotes | |
| Funding Acknowledgement | |