X-ray diffraction from adsorbed iodine on graphite
X-ray diffraction from adsorbed iodine on graphite
复制标题
石墨上吸附碘的 X 射线衍射
作者：
M. Fleischmann;P. Hendra;J. Robinson
我们对固体-真空界面的表面结构的认识主要是通过高真空分析技术获得的。不幸的是，这些可能无法原位应用于具有更大实际重要性的固-液或固-高压气体界面。已经进行了非原位调查，但所涉及的转移可能导致表面重组。因此，显然需要现场技术。拉曼光谱1是适用的，但缺乏通用性，而中子衍射2和SEXAFS 3是有前途的，但分别取决于反应堆和同步加速器。另一方面，X射线衍射是常规进行的，并且理论发展得很好，尽管它被认为对表面不敏感。我们在这里报告的第一次观察到的X射线衍射从二维吸附物形成的固液界面，I2碳，使用位置敏感的检测，以提高灵敏度。
Our knowledge of surface structure at the solid–vacuum interface has been acquired largely through high-vacuum analytical techniques. Unfortunately these may not be applied in situ to solid–liquid or solid–high-pressure gas interfaces which are of greater practical importance. Ex situ investigations have been made but the transfers involved probably result in surface restructuring. It is therefore apparent that in situ techniques are required. Raman spectroscopy1 is applicable but lacks versatility, whilst neutron diffraction2 and SEXAFS3 are promising but depend on a reactor and synchrotron respectively. X-ray diffraction, on the other hand, is routinely performed and the theory is well developed though it has been assumed to be insensitive to surfaces. We report here the first observation of X-ray diffraction from a two-dimensional adsorbate formed at the solid–liquid interface, I2 on carbon, using position-sensitive detection to enhance sensitivity.