XPS and LEED study of a single-crystal surface of pyrite
XPS and LEED study of a single-crystal surface of pyrite
复制标题
DOI：
10.2138/am-1996-1-234
复制
发表时间：
1996-02
影响因子：
3.1
通讯作者：
S. Chaturvedi;R. Katz;J. Guevremont;M. Schoonen;D. Strongin
中科院分区：
文献类型：
--
作者：
S. Chaturvedi;R. Katz;J. Guevremont;M. Schoonen;D. Strongin
摘要本文报道了用低能He ~+离子轰击和热退火处理的黄铁矿（FeS_2）（100）表面的X射线光电子能谱（XPS）和低能电子衍射（LEED）结果。LEED表明，以这种方式制备的原子级清洁的黄铁矿表面是不可重构的。XPS S 2 P数据显示，该表面没有证据表明一个单硫化物物种共存的二硫化物部分，特征黄铁矿。这一实验观察与许多先前的研究形成对比，这些研究通过解理或机械切割制备黄铁矿表面并观察到单硫化物物种。我们认为，直接从生长的表面制备的黄铁矿表面可能更好地代表一个自然的表面比制备方法，如裂解。
Abstract This work reports X-ray photoelectron spectroscopy (XPS) and low-energy electron diffraction (LEED) results for an as-grown (100) surface of pyrite (FeS2) cleaned by low-energy He+ ion bombardment and thermal annealing. LEED suggests that the atomically clean pyrite surface prepared in this manner is unreconstructed. XPS S 2p data for this surface show no evidence for a monosulfide species coexisting with the disulfide moiety that characterizes pyrite. This experimental observation contrasts with many prior studies that prepared pyrite surfaces by cleavage or mechanical cutting and observed a monosulfide species. We argue that a pyrite surface prepared directly from the as-grown surface may better represent a natural surface than does a preparation method such as cleavage.