|Title||Population dynamics of H- local modes in CaF2 : Lu3+ crystals studied using a free-electron laser|
|Publication Type||Journal Article|
|Year of Publication||2001|
|Authors||J.PR Wells, I.V Bradley, G.D Jones, C.R Pidgeon|
|Journal||Journal of Physics-Condensed Matter|
|Date Published||Mar 12|
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.
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