Abstract
The study of TGS single crystal plates at 4 K shows that the part of the far infrared absorption spectra located at v < 80 cm −1 is hardly sensitive to thickness d for 4 μm < d < 1400 μm. This surprising result is interpreted in the frame of a new surface-layer model recently described to explain the drastic modifications of electrical properties when d is decreased down to 1 μm. From the far infrared data analysis the absorption is enhanced by one to three orders of magnitude in the surface layer.
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