Ultrafast Transfer and Transient Entrapment of Photoexcited Mg Electron in Mg@C60

Electron relaxation is studied in endofullerene Mg@C-60 after an initial localized photoexcitation in Mg by nonadiabatic molecular dynamics simulations. Two approaches to the electronic structure of the excited electronic states are used: (i) an independent particle approximation based on a density-functional theory description of molecular orbitals and (ii) a configuration-interaction description of the many-body effects. Both methods exhibit similar relaxation times, leading to an ultrafast decay and charge transfer from Mg to C-60 within tens of femtoseconds. Method (i) further elicits a transient trap of the transferred electron that can delay the electron-hole recombination. Results shall motivate experiments to probe these ultrafast processes by two-photon transient absorption or photoelectron spectroscopy in gas phase, in solution, or as thin films.

Automated summary

The study investigates the electron relaxation in endofullerene Mg@C-60 following photoexcitation in Mg, leading to ultrafast decay and charge transfer within tens of femtoseconds. Experimental results suggest that method (i) can delay the electron-hole recombination process.