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N. Geis, G. Kaspar, and S. Hunklinger, in Nonmetallic Materials and Composites at Low Temperatures, edited by G. Hartwig and D. Evans (Plenum, New York, 1986), Vol. 3, pp. 99-105.
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36
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0039815468
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We want to mention that although this formula (12) is sufficient for all practical purposes, the relaxation process itself is not classical for the high barriers needed in the temperature regime of the absorption peak. Instead, relaxation occurs via direct tunneling from many excited levels of the DWP and intrawell vibrational transitions between theses states. The Arrhenius rate (12) has to be seen as an effective rate whose exponential temperature dependence arises from transitions between different vibrational levels of each well via the Orbach process. See, P. Neu and A. Heuer, J. Chem. Phys. 106, 1749 (1997) for more details.
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Neu, P.1
Heuer, A.2
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39
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85033306323
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note
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max gives an expected peak temperature of ∼10 K. Comparing this with the data of Fig. 12 in Ref. 30, one clearly sees that this peak temperature is too low to separate the relaxation peak from the plateau.
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