Previous conclusions on the propagation of ultrashort light pulses in a resonant medium are found to be in error. There is no physical basis for rejecting the nd u and dn u solutions.

In a crossed supersonic atomic beam apparatus measurements have been performed on the glory structure in the total cross section of the heavy noble gas systems Kr-Kr, Kr-Xe and Xe-Xe. Refinements in the deconvolution procedures are described and the consistency of the results is tested on newly...

A model for the exact treatment of a suspension of heavy particles is presented. The model consists of a one-dimensional set of suspended particles in a harmonic oscillator assembly. It is shown that in the double limit as the ratio of the masses (M) of the heavy particle to the particle of the...

The λ-transition is analyzed in the framework of quantum statistical mechanics without invoking the idea of universality. Wilson's renormalization group transformation technique is applied in what we call the rescaled occupation number representation (RONR). This reveals the role that the Bose...

We have proposed a new model to investigate a substitutional magnetic impurity in non-magnetic metal. The model takes into account the electron correlations in both the host narrow band and the magnetic impurity orbital. Exact solutions for the thermodynamic properties of small systems of four...

Exact recursion formulae are derived for numerically calculating the means and variances of the quasi-stable state transition times for a simple class of spatially homogeneous, nonequilibrium chemical systems. Application of these formulae to some specific cases of the Schlögl model indicates...

The interaction law for defect states of the vortex-pair type in the planar rotator model with long-range interaction 1rα and 2⩽α⩽4, is derived. It is shown that the constituents of a vortex-pair do not interact via a log r law as it is the case for the short-range interaction but are more...

Transport properties of a collisionless molecular gas between plane-parallel plates are influenced by a magnetic field because of precession of the molecules after polarization by surface collisions. A systematic analysis of phenomena of this kind is attempted by considering mass flow in two...

As an application of the general theory given in the previous paper1), distorted wave Born approximation calculations on the depolarized linewidths for H2 and D2 systems are presented. An assumed square well model for the spherical potential and dominant P2 and quadrupole-quadrupole nonspherical...

A class of initial value problems for a one-dimensional hard sphere gas is considered where a specified particle has a given distribution f(1)(z1; 0) and the rest are in equilibrium at t=0. An exact expansion is obtained for a certain n-particle reduced distribution function f(n)(z1;…;zn; t) in...