Variation of intensity of scattered light with temperature

5. Summary

The intensity of scattering is found to increase with rise in temperature in benzene and acetic acid and to decrease with rise in temperature in nitrobenzene and formic acid. Such differences in the behaviour of these liquids are only apparent and are attributed to the fact that the scattered beam is ordinarily an admixture of two types, namely, density scattering and orientation scattering. When the aggregate intensity is suitably separated into these two constituent parts, the density scattering is always found to increase with increasing temperature as should be expected whereas the orientation scattering sometimes increases (example is benzene) and sometimes decreases (examples are nitrobenzene, acetic acid and formic acid). The observed effect is an aggregate of these two phenomena.

The author takes it his great pleasure to express his most grateful thanks to Mr. S. Bhagavantam, the Head of the Physics Department for the very keen interest he has taken in his work and the valuable guidance he has rendered.