@article{6138,
  author = {J. P. R. Wells and I. V. Bradley and G. D. Jones and C. R. Pidgeon},
  title = {Population dynamics of H- local modes in CaF2 : Lu3+ crystals studied using a free-electron laser},
  abstract = {We report on pump-probe measurements of vibrational decay times for the H- (X, Y) and Z local modes of CaF2:Lu3+ C-4 nu H- centres using the Dutch free-electron laser. For excitation of the (X, Y) mode, a 10 K lifetime of 43 picoseconds is measured and is attributable to three-phonon anharmonic relaxation. which accounts well for the temperature dependence of the decay rate. The 10 K Lifetime of the higher-energy Z mode results from a combination of one-phonon decay to the (X, Y) modes and three-phonon decay to the ground state. A simple rate equation model gives a good account of the observed transient.},
  year = {2001},
  journal = {Journal of Physics-Condensed Matter},
  volume = {13},
  number = {10},
  pages = {2137-2145},
  month = {Mar 12},
  isbn = {0953-8984},
  doi = {10.1088/0953-8984/13/10/308},
  language = {eng},
}