Low Angle, Light Scattering Photometer Model LS-2

A light scattering instrument capable of routine measurements at angles as low as 9 degrees is described. The reduced scattered intensities can be determined, with use of a vertically polarized incident light, correct to 0.5 ~ 1.0%, unless the scattering of the solution over solvent is less than 10(-5) cm(-1). The correction for the back reflection of the incident beam can be ignored because the light is absorbed by a glass neutral filter before it reaches a glass-air interface. A sample liquid can be brought to a temperature equilibrium in less than 30 min, and the temperature can be kept constant within +/-0.02 degrees C, in the temperature range from 5 degrees C to 100 degrees C. No special optical specification is required in making a cell, and the geometrical correction is simply given by sin-10 correct to +/-0.7%.