Wilhelm, R. A. (2024, April 11). Determining ultrafast surface charge dynamics on 2D materials by ion-electron coincidence spectroscopy [Presentation]. Physics Colloquium, Faculty of Physics, University of Groningen, Groningen, Netherlands (the).
The interaction of multiply charged ions with solid surfaces can induce strong and localized electronic excitations as a result of charge exchange.
While ultimately these exciations can be used for material modifications on the atomic scale through electronic sputtering, the susceptibility of a surface to this type of nanoscale machining is determined by the local surface response to strong excitations.
Probing the nanoscale charge dynamics on a femtosecond timescale is challenging, but using promptly emitted (messenger) electrons from the ion
impact on a freestanding 2D material in coincidence with the transmitted ion finally allows a detailed insight on how long an induced surface charge stays confined.
