Zubavichus Yan, Zharnikov Michael, Yang Yong-Jie, Fuchs Oliver, Umbach Eberhard, Heske Clemens, Grunze Michael
Angewandte Physikalische Chemie, University of Heidelberg, INF 253, 69120 Heidelberg, Germany.
Langmuir. 2006 Aug 15;22(17):7241-7. doi: 10.1021/la060379o.
Multilayer ice films deposited on polycrystalline Au(111) substrates at 90 and 153 K under ultra-high-vacuum conditions are studied using O K-edge X-ray absorption fine structure spectroscopy in the surface-sensitive partial electron yield mode. Both near-edge and extended oscillatory fine structures are analyzed in combination with the theoretical real-space full-multiple-scattering simulations based on the FEFF8 code. The experimental data consistently indicate that the local structure of the near-surface regions in ice films at both substrate temperatures resembles that of high-density crystalline modifications of ice (e.g., ice II, ice III, or high-density amorphous ice). In addition, the ice films deposited at 153 K most probably contain a minor fraction of low-density cubic ice (I(c) phase).
在超高真空条件下，于90 K和153 K温度下沉积在多晶Au(111)衬底上的多层冰膜，采用表面灵敏的部分电子产率模式下的O K边X射线吸收精细结构光谱进行研究。结合基于FEFF8代码的理论实空间全多重散射模拟，对近边和扩展振荡精细结构进行了分析。实验数据一致表明，在这两种衬底温度下，冰膜近表面区域的局部结构类似于冰的高密度晶体变体（如冰II、冰III或高密度非晶冰）。此外，在153 K沉积的冰膜很可能含有少量的低密度立方冰（I(c)相）。
