UV REFRACTIVE-INDEXES OF AQUEOUS AMMONIUM-SULFATE SOLUTIONS

Refractive indices of aqueous solutions of ammonium sulfate were measu red over a wavelength range of 240 to 400 nanometers (nm) at a tempera ture of 292 K. The solutions examined cover a broad range from the sat uration concentration of ammonium sulfate in water at 292 K down to lo w concentrations. Solutions studied were: 42.5, 30.4, 23.6, 16.3, 8.5 weight per cent ammonium sulfate. Optical field measurements of these aerosols require knowing the necessary optical constants, and these co nstants in the ultraviolet (UV) are given here. Our results were found to be in agreement with literature values at longer wavelengths. Addi tionally, a Lorentz-Lorenz analysis is presented to extend our results to other wavelengths and temperatures.