Persistent oscillations of X-ray speckles: Pt (001) step flow

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Title: Persistent oscillations of X-ray speckles: Pt (001) step flow
Author: Pierce, Michael; Hennessy, D.; Chang, K.; Komanicky, V.; Strzalka, J.; Barbour, A.; You, H.
Abstract: We observed well-defined oscillations of speckle intensities from Pt (001) surfaces at high temperatures, persisting for tens of minutes. We used a model of hex-reconstructed terraces to show that the coherent x-rays reflected from the terraces retain their phases relative to the illumination boundary and the observed oscillations come from surface dynamics due to “step-flow” motion. Our results demonstrate a possibility that x-ray speckles can be applied to monitor the real-time evolution of surfaces.
Description: Applied Physics Letters 99, 121910 (2011); doi:10.1063/1.3640227
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Date: 2011

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