Values for the depolarization ratio (ϱTV) of Rayleigh scattered light are reported for a large number of gas molecules. When possible, the results are combined with refractive index data to yield the anisotropy in the optical polarizability.

The dynamic properties of an n-component phonon system in d dimensions, which serves as a model for a structural phase transition of second order, are investigated. The symmetry group of the hamiltonian is the group of orthogonal transformations O(n). For n ≥ 2 a continuous symmetry is broken...

In the usual quark-model treatment of the radiative decay of vector mesons, assumption is made that the photon is emitted by the valence quarks alone. This assumption leads to the prediction of the amplitude ratio A(ϱ → πγ)A(ω → πγ) = 13 that is nearly independent of detailed dynamics....

A quantum open system S, interacting with a reservoir R is considered. The kernel of the generalized master equations (G.M.E.'s), usually deduced to describe the dynamics of S, is expressed in terms of time correlation functions of the bath operators involved in the interaction between S and R,...

A new expression for the expansion coefficient of a flexible chain polymer molecule can be given in such a way that its first term corresponds to the case with only a hard-sphere repulsion and the other terms represent the effects of attraction between the segments. For low and high...

In the following we derive a non-linear Fokker-Planck equation in the momentum space, and a non-linear Kramers-Chandrasekhar equation in the μ space for semiclassical fermions and bosons. The medium is still represented by a Gaussian random process, but the transition probabilities are so...

The joint distribution function in phase space is related to the density matrix by an integral transformation which depends on the rule of correspondence used. All the requirements which can be restrictive for the kernel function defining the transformation are studied. It is shown that the...

The present work consist of two parts: In the first part we apply the method of quasilinearization to the differential equation describing the time development of the quantum-mechanical probability density. In this way we derive the master equation without resorting to perturbation theory. In...

The neglect of chain flexibility in Manning's theory of polyelectrolytes is assessed. For a flexible polyelectrolyte-the uniformly charged wormlike chain-counterion condensation is unaffected but colligative properties need to be modified. The relevant dimensionless parameter is (κLT)-1 where...

High-temperature expansions are derived for the specific heat and the χzz element of the susceptibility tensor for a linear chain of spins 12 with anisotropic nearest-neighbour interactions. (The coupling constants J1, J2 and J3 are chosen to be different.) Use is made of exact results of the...