On the theory of molecular polarization in gases

Dielectric constant of atomic fluids with variable polarizability

“…This article must therefore be hereby marked "advertisement" in accordance with 18 U. S. C. §1734 solely to indicate this fact. [6] E+247r 3 in which the polarizability on the right-hand side of Eq. 6 is written as the average value of the N-body polarizability.…”

“…Introducing the explicit forms for a and f3, as given in Eqs. 3 and in which p is the density, N/V, and g(r) is the pair radial distribution function. Calculations of the pair terms are trivial.…”

“…As for the intermolecular pair potential, the only part of this pair polarizability that is rigorously known (besides the classical part) is the large separation asymptotic term. This term is of the same physical origin as the London dispersion term of the van der Waals attraction and, just like it, decays as A/r6, where A is a constant that measures the correlation between the motion of the electrons in a pair of atoms (3,4). It is a quantum mechanical term, and is labeled QM to distinguish it from the classical dipole-induced dipole (DID) interaction that asymptotically varies with the same power of r. As in the Lennard-Jones potential, we are forced at present to add to the long-range part an empirical term that can be either an exponential or a power law in order to account for the short-range (SR) distortions in the individual polarizabilities due to repulsive interactions between a pair of atoms (5).…”

Correction to the Clausius–Mosotti equation: The dielectric constant of nonpolar fluids from Monte Carlo simulations

“…The non-ideality of the charge distribution of the molecule is probably an important issue that captured the attention of several researchers over the years who modified the KY theory by including quadrupole [28][29][30][31][32][33][34][35] and octopole moments 36 . All these authors conclude that the effect of higher order terms is not negligible (supported by the experimental result that the correction is larger for CO 2 than for Ar).…”

“…Jansen et al [28][29][30][31] raised the possibility that the molecular polarizability, α, is no longer a well defined molecular quantity, but it depends on the density. At high densities, the molecules can modify each others' structure and the apparent polarizability of colliding molecules can be different from that of the isolated molecules.…”