Abstract
Photon echo spectroscopy has been extensively used to characterize the low-temperature relaxations in amorphous solids. However, the relatively high excitation energies used in the actual experiments (20–200µJ/g) lead to serious problems with sample heating since the specific heat of amorphous solids is on the order of 300µJ/gK at 2 Kelvin. We present data for the amorphous system polymethylmethacrylate and discuss the different contributions to the heating process.
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