普鲁士蓝
化学
飞秒
超短脉冲
自旋跃迁
化学物理
自旋(空气动力学)
氰化物
双金属片
纳米技术
电荷(物理)
光化学
激光器
物理化学
材料科学
结晶学
光学
无机化学
物理
有机化学
电极
金属
热力学
量子力学
电化学
作者
Marco Cammarata,Serhane Zerdane,Lodovico Balducci,Giovanni Azzolina,Sandra Mazérat,Cécile Exertier,Matilde Cardoso Trabuco,Matteo Levantino,Roberto Alonso-Mori,James M. Glownia,Sanghoon Song,Laure Catala,Talal Mallah,Samir F. Matar,Éric Collet
标识
DOI:10.1038/s41557-020-00597-8
摘要
Photoinduced charge-transfer is an important process in nature and technology and is responsible for the emergence of exotic functionalities, such as magnetic order for cyanide-bridged bimetallic coordination networks. Despite its broad interest and intensive developments in chemistry and material sciences, the atomic-scale description of the initial photoinduced process, which couples intermetallic charge-transfer and spin transition, has been debated for decades; it has been beyond reach due to its extreme speed. Here we study this process in a prototype cyanide-bridged CoFe system by femtosecond X-ray and optical absorption spectroscopies, enabling the disentanglement of ultrafast electronic and structural dynamics. Our results demonstrate that it is the spin transition that occurs first on the Co site within ~50 fs, and it is this that drives the subsequent Fe-to-Co charge-transfer within ~200 fs. This study represents a step towards understanding and controlling charge-transfer-based functions using light.
科研通智能强力驱动
Strongly Powered by AbleSci AI