Abstract
Remarkable differences in some physical properties, such as number density, shear viscosity, sound velocity and adiabatic compressibility, were observed above 40 °C in the isotopomer pair CH3CN and CD3CN. These differences do not fall within the normal dynamic isotope effects; they were demonstrated by studying the Brillouin spectra of liquid CD3CN as a function of temperature and wavevector, correlating the scattering measurements with those of density and viscosity. An interpretation of these peculiar effects is attempted on the basis of the small differences in the intermolecular interactions in the two isotopomers. Copyright © 1999 John Wiley & Sons, Ltd.
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