Ultrafast electronic line width broadening in the C 1s core level of graphene

Time-, k-, and energy-resolved photoemission data for C 1s in H-intercalated graphene on SiC (QFMLG).

Here we use a free electron laser to investigate the effect of a transiently excited hot electron gas on the core level spectrum of graphene, showing that it leads to a substantial broadening of the C 1s line shape.