Optical properties Rayleigh scattering

Small Particles—The optical properties of suspended particles depend on a number of variables. In his important contributions on the color of the sky, Rayleigh (1871) set forth the equation governing the intensity of light scattered by small spherical particles of uniform size in a gaseous medium. This equation for a single particle is as follows ... 

This paper reviews the optical properties of undoped and activated fluoride glasses for the period 1985-1998. First, the infrared transmission, Rayleigh scattering, and refractive indices of several fluoride glasses are given and discussed. For the sake of completeness, fundamental physical characteristics such as thermo-mechanical properties are also given, although they may have been published before this period. 

As written, the CIDs (2.3) and (2.5) apply to Rayleigh scattering. The same expression can be used for Raman optical activity if the property tensors are replaced by corresponding vibrational Raman transition tensors. This enables us to deduce the basic symmetry requirements for natural vibrational ROA 15,5) the same components of aap and G p must span the irreducible representation of the particular normal coordinate of vibration. This can only happen in the chiral point groups C , Dn, O, T, I (which lack improper rotation elements) in which polar and axial tensors of the same rank, such as aaP and G (or e, /SAv6, ) have identical transformation properties. Thus, all the Raman-active vibrations in a chiral molecule should show Raman optical activity. 

V.6.1. Light Scattering by Small Particles (Rayleigh Scattering) 390 V.6.2. Optical Properties of Disperse Systems Containing... 

Attenuation is caused by a combination of absorption and scattering within the glass. Extrinsic attenuation is due to poor processing or fabrication techniques, and may be due to artefacts such as bubbles, particles, impurities and variable fibre dimensions. These problems have been eliminated in modem optical fibre manufacture. Intrinsic attenuation is a property of the pure material itself and cannot be removed by processing. It is the ultimate limit on the performance of the fibre and mainly arises firom two factors, Rayleigh scattering and lattice vibrations. 

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