, Volume 18, Issue 3, pp 354-362

Infrared absorption of glassy silicon dioxide

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The infrared reflectivity of glassy silicon dioxide has been measured in the region of 2–35 μm at room temperature. The reflectivity curve has been analyzed by means of Kramers-Kronig analysis and the optical constants have been determined. In addition to the three known peaks at 9 μm, 12·5 and 22·5 μm, the absorption curve exhibits further peaks at 17·5 and 11 μm. A correlation with the transmissivity measurements has shown that in this region even the transmissivity curve exhibits a decrease. An attempt has been made at an interpretation of the spectrum according to Matossi's model of vibrations of the free tetrahedron SiO4.

The authors thanks Dr. A. Vaško for enabling us to perform the measurement with the adapter for absolute reflectance and Dr. V. Čižek for his permission to use the computer programme and for stimulating discussions.