Dynamics of Persistent Hole Burning in Organic Glasses and Its Fractal Interpretation

概要

論文の詳細を見る
We have derived a non-exponential stimulated photon echo decay functionexp ( -car"') by assuming that the TLSs of the amorphous host are spatiallydistributed like a fractal with a fractal dimension D, where c is a constant, Iis thetemperature and r is the delay time between the first and second excitation pulses.From this function and the measured photon echo decay curves and hole shapes, weobtained D=2.I -2.3 for 1,3,3,1',3',3'-hexamethyl-2,2'-indotricarbocyanine iodidein polyvinyl alcohol (HITC/PVA), and D=2.7 for IIITC in ethanol (HITC/EtOH).These values of D are consistent with the possible structures of the long chainedpolymeric glass and the monorneric glass, respectively. The photon echo decay func-lion also gives a power law temperature dependence of the hole width F.... asT....cc T"'. The deviation of the hole width in HITC /PVA from the power law fern-perature dependence at high temperatures is explained by a fracton mode of the armor-phous host.persistent hole burning, organic glasses, amorphous, fractal, two-level system,stimulated photon echo, non-exponential photon echo decay, fracton,polymeric glass, monomeric glass
社団法人日本物理学会の論文
1991-10-15