报告摘要：

The low ionization potentials make alkali atoms obliging electron donors in reduction chemistry in important industrial chemical processes, where they act as cocatalysts. Interaction between potassium atoms and nitrogen molecules co-adsorbed on metal surfaces is of interest as a model of catalytic promotion of dissociation of a reluctant precursor, N₂, which is considered to be the rate-limiting step in the Haber-Bosch ammonia synthesis. Although the atomic scale insight into the co-adsorption of K and N₂ on metals is fundamentally important for understanding the alkali promotion chemistry, the high mobility of K atoms, the weak chemisorption of N₂, and the extreme pressure and temperature conditions in the Haber-Bosch process obstruct investigation of their interactions at the atomic scale. By scanning tunneling microscopy and density functional theory, here we characterize the N₂ adsorption, collective interactions, and tunneling electron-induced desorption on K/Ag(111) surface. Our study reveals the fundamental collective interactions of alkali promoters with the N₂ molecular feedstock of consequence to heterogeneous catalysis.

个人简介：

张超，中国科学技术大学副研究员。2006年和2012年分别获得中国科学技术大学本科和博士学位。2012年-2015年在中科院固体物理研究所任助理研究员。2015年至2018年在韩国首尔大学物理与天文系做博士后研究（合作教授Younk Kuk）。2018年至2021年在美国匹兹堡大学物理与天文系做博士后研究（合作教授Hrvoje Petek）。2021年至今，在中国科学技术大学任副研究员。致力于超高真空环境下单分子体系扫描探针显微镜表征与高灵敏度单光子检测研究工作，利用扫描探针显微镜高的空间分辨率进而探索单分子化学以及单分子光电子学等前沿研究领域。研究工作重点是扫描隧道显微镜相关技术发展，单分子体系扫描隧道显微镜诱导发光，单分子探针增强拉曼光谱以及单分子体系化学反应等，在国内外期刊发表研究论文20余篇。

张超