INFRARED SPECTRUM OF ICE Ih IN THE RANGE 4000 TO 15 CM-1,
NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF APPLIED CHEMISTRY
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The first part of the report concerns the origin of the well-known difference between the optical and microwave refractive indices of ice, which are 1.31 and 1.78 respectively, corresponding to permittivities of 1.72 and 3.1. The absorptivity of ice Ih over the range 4000 to 30 reciprical cm was measured. The contributions of the various bands to the microwave refractive index have been evaluated by means of the Kramers-Kronig relations. The second part of the report concerns the absorption of light by the sound waves of ice. As ice is on orientationally disordered crystal, all its vibrations are infrared active. Hence, the spectrum of the band of translational vibrations below 325 reciprical cm is closely related to the density of vibrational states.
- Atomic and Molecular Physics and Spectroscopy