Abstract
When only two substances, in equilibrium with each other, are responsible for all absorption in a given wavelength region, there must exist at least one point in the spectrum where the absorption coefficient will be independent of the ratio of the concentrations of the two substances. The wavelength at which this occurs is called the isosbestic point, which is uniquely satisfactory for quantitative determinations of the amounts of the two substances present and provides an internal standard to which absorption coefficients at other wavelengths can be compared. Isosbestic points are found in many spectra of droplet aerosols, and it is shown that it should be feasible to use them for remote spectral monitoring and quantitative analyses of droplet solution and chemical reactions if the complex indices of refraction are known. The technique seems most applicable in the Rayleigh regime.
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