Wang Jianyu, Lu Deyu, Li Chaoran, Zhu Yaguang, Boscoboinik Jorge Anibal, Zhou Guangwen
Department of Mechanical Engineering & Materials Science and Engineering Program, Binghamton University State University of New York, Binghamton, New York 13902, United States.
Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States.
J Phys Chem Lett. 2020 Aug 20;11(16):6827-6834. doi: 10.1021/acs.jpclett.0c02002. Epub 2020 Aug 7.
Charge transfer between dissimilar atoms is an essential step for many chemical processes such as corrosion and heterogeneous catalysis, but directly probing the charge transfer has been a challenge. Using the oxygen-copper system as an example, we show that synchrotron-based ambient pressure X-ray photoelectron spectroscopy can be employed to monitor the charge transfer between adsorbates and metal surfaces. It is shown that oxygen chemisorption on Cu surfaces results in an Auger process that differs from the photoexcitation-induced Coster-Kroning transition and can be used to derive the degree of charge transfer in combination with ab initio calculations. The identified chemisorption-induced Auger process may have broader implications for its use as a fingerprint to monitor bond formation and charge transfer between dissimilar atoms.
不同原子之间的电荷转移是许多化学过程（如腐蚀和多相催化）的关键步骤，但直接探测电荷转移一直是一项挑战。以氧 - 铜体系为例，我们表明基于同步加速器的常压X射线光电子能谱可用于监测吸附质与金属表面之间的电荷转移。结果表明，氧在铜表面的化学吸附会导致一种俄歇过程，该过程不同于光激发诱导的科斯特 - 克罗宁跃迁，并且结合从头算计算可用于推导电荷转移程度。所识别出的化学吸附诱导俄歇过程作为监测不同原子间键形成和电荷转移的指纹可能具有更广泛的意义。
