@article{KlamrothNest2009,
  author    = {Klamroth, Tillmann and Nest, Mathias},
  title     = {Ultrafast electronic excitations of small sodium clusters and the onset of electron thermalization},
  issn      = {1463-9076},
  doi       = {10.1039/B813619j},
  year      = {2009},
  abstract  = {In this paper we report simulations of the ultrafast laser excitation and relaxation of the correlated valence electrons of a Na-8 cluster. The aim is twofold: first, while the total energy stays constant when the exciting laser pulse is over, we observe that the entropy computed from the reduced one electron density matrix rises on a much longer time scale. We discuss whether this can be understood as the onset of the thermalization of a finite system. Second, we describe this process with eight different methods of wavefunction-based electronic structure theory, which have been adapted for an explicitly time-dependent description. Their respective advantages and limitations for the simulation of the excitation and subsequent relaxation are explained.},
  language  = {en}
}