▎ 摘　　要

We have determined the electronic bandstructure of clean and potassium-doped single layer graphene, and fitted the graphene pi bands to a one- and three-near-neighbor tight binding model. We characterized the quasi-particle dynamics using angle resolved photoemission spectroscopy. The dynamics reflect the interaction between holes and collective excitations, namely plasmons, phonons, and electron-hole pairs. Taking the topology of the bands around the Dirac energy for n-doped graphene into account, we compute the contribution to the scattering lifetimes due to electron-plasmon and electron phonon coupling.