We consider the properties of Ω graphs (Ω versus f(z)) obtained from Gouy interferometry on multicomponent systems with constant diffusion coefficients. We show that they must have (a) either a maximum or else a minimum between f(z)=0 and f(z)=1 and (b) an inflection point between the f(z) value at the extremum and f(z)=1. Consequently, an Ω graph cannot have both positive and negative Ω values.
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This article is dedicated to Joseph A. Rard, a friend, colleague, and outstanding experimentalist.
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Miller, D.G. Gouy Interferometry: Properties of Multicomponent System Omega (Ω) Graphs. J Solution Chem 36, 1469–1477 (2007). https://doi.org/10.1007/s10953-007-9194-6
- Gouy interferometry
- Omega graphs
- Rayleigh interferometry
- Multicomponent systems