We present coherent speckled x-ray diffraction patterns obtained from a monolayer of surface atoms. We measured both the specular anti-Bragg reflection and the off-specular hexagonal reconstruction peak for the Au (0 0 1) surface reconstruction. We observed fluctuations of the speckle patterns even when the integrated intensity appears static. By auto-correlating the speckle patterns, we were able to identify two qualitatively different surface dynamic behaviors of the hex reconstruction depending on the sample temperature.
@article{arxiv.0909.2273,
title = {Surface X-ray Speckles: Coherent Surface Diffraction from Au (0 0 1)},
author = {M. S. Pierce and K. C. Chang and D. Hennessy and V. Komanicky and M. Sprung and A. Sandy and H. You},
journal= {arXiv preprint arXiv:0909.2273},
year = {2015}
}
Comments
15 pages, 4 figures. Accepted to Phys. Rev. Lett. 9/2009