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Infrared absorption ''/ν of vitreous silica is calculated from the dielectric dispersion measured at low frequencies. The calculated ''/ν shows a peak around 1THz above 450K. The peak height increases as the temperature rises. These indicate that the thermally activated relaxation mode turns to an anharmonic vibration mode. The calculated ''/ν is compared with the measured one at 11 and 297K.
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