Structural Dynamics of Adsorption Equilibrium for Iodine Adsorbed on Au(111)
Structural Dynamics of Adsorption Equilibrium for Iodine Adsorbed on Au(111)
复制标题
Au(111)上碘吸附平衡的结构动力学
DOI：
10.1021/acs.jpcc.0c05330
复制
发表时间：
2020
期刊：
影响因子：
3.7
通讯作者：
and Nagahiro Hoshi
中科院分区：
文献类型：
--
作者：
Masashi Nakamura;Yuma Tanaka;Masamitu Takahasi;Hiroo Tajiri;Osami Sakata;and Nagahiro Hoshi
使用 X 射线光子相关光谱 (XPCS)、电化学扫描隧道显微镜 (STM) 和时间分辨 X 射线衍射研究了 Au(111) 上吸附的碘化物层的结构动力学。在恒定电极电位下的碘化物吸附平衡时，定期捕获的STM图像显示有序吸附的碘化物层中原子空位的迁移。结果表明，在平衡状态下，可逆吸附/解吸和位点转换连续发生。尽管根据 STM 图像，过渡发生在不同的时间尺度，但根据 XPCS 测量，镜面位置处自相关函数的时间衰减估计为 127 秒。使用 XPCS 观察到的动力学表明，表面层的垂直弛豫与碘化物的吸附有关。
The structural dynamics of an iodide layer adsorbed on Au(111) were investigated using X-ray photon correlation spectroscopy (XPCS), electrochemical scanning tunneling microscopy (STM), and time-resolved X-ray diffraction. At the adsorption equilibrium of iodide at a constant electrode potential, the STM images captured at regular intervals show the migration of atomic vacancy sites in the ordered adsorbed iodide layer. The results indicate that reversible adsorption/desorption and site conversion continuously occur at the equilibrium state. Although the transitions occur at various time scales according to the STM images, the time decay of the autocorrelation function at the specular position is estimated to be 127 s according to the XPCS measurement. The dynamics observed using XPCS suggest that the vertical relaxation of the surface layers is associated with the adsorption of iodide.