Fluctuations in Water, Aqueous tert-Butanol and 2-Butoxyethanol: Amplitude and Wavelength of Fluctuation

摘要

We study fluctuations in liquid H_2O and aqueous solutions of tert-butanol and 2-butoxyethanol. We calculate the fluctuation density and the normalized fluctuation. The former shows the amplitude (or the intensity) of fluctuation, and the latter are indicative of the amplitude plus the wavelength (the extensity) of fluctuation. Three kinds of fluctuations are evaluated, the mean square volume fluctuation, the mean square entropy fluctuation, and the cross fluctuation between volume and entropy.