TY - JOUR
T1 - Population dynamics of H- local modes in CaF2
T2 - Lu3+ crystals studied using a free-electron laser
AU - Wells, J. P R
AU - Bradley, Ian V.
AU - Jones, Glynn D.
AU - Pidgeon, Carl R.
PY - 2001/3/12
Y1 - 2001/3/12
N2 - We report on pump-probe measurements of vibrational decay times for the H- (X, Y) and Z local modes of CaF2:Lu3+ C4v 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.
AB - We report on pump-probe measurements of vibrational decay times for the H- (X, Y) and Z local modes of CaF2:Lu3+ C4v 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.
UR - http://www.scopus.com/inward/record.url?scp=0035848273&partnerID=8YFLogxK
U2 - 10.1088/0953-8984/13/10/308
DO - 10.1088/0953-8984/13/10/308
M3 - Article
SN - 0953-8984
VL - 13
SP - 2137
EP - 2145
JO - Journal of Physics: Condensed Matter
JF - Journal of Physics: Condensed Matter
IS - 10
ER -