Accurate potentials for ground state krypton-krypton and xenon-xenon interactions are derived using a wide range of experimental evidence including second virial coefficients, gas transport properties, solid state data, known long-range interactions, spectroscopic information on dimers, and new measurements of differential scattering cross sections. In calculating solid-state properties account is taken of long-range many-body interactions. The use of the potentials permits a critical intercomparison of various kinds of experimental data. A ``corresponding states'' comparison of the shapes of the potentials for different inert gas pairs is given. It is concluded that contributions of overlap-dependent many-body interactions to condensed-phase properties of argon, krypton, and xenon are very small.

Erratum: Intermolecular potentials from crossed beam differential elastic scattering measurements. I. Ne +Ar, Ne +Kr, and Ne +Xe High-resolution low-energy elastic differential cross sections have been measured for Ar-Ar over a wide angular range. Rainbow structure as well as symmetry oscillations at wide angles were resolved. These results are used to evaluate 16 different Ar-Ar potentials proposed previously and also to construct a new potential. Vibrational energy levels and the second virial coefficient calculated for the new potential are compared with experimental results.Lattice modes have been observed at 37 and 81 cm-1 in Raman spectra of orthorhombic polyoxymethylene. The normal modes of the orthorhombic polyoxymethylene crystal have been calculated and used to assign the lattice modes. The intermolecular potential has been evaluated and used to compute the dispersion curves and frequency distribution of the crystal. The calculated frequency distribution has been compared to that observed experimentally by inelastic neutron scattering.

The elastic differential cross section for 3He–4He was measured at a relative collision energy of 0.799×10−14 erg, approximately five times the well depth. The data are fitted to a multiparameter potential form with ε/k=10.57 °K and rm=2.97 Å. Comparisons with recent experimental and theoretical helium potentials are made. No evidence for a significant isotope effect in the 3He–4He and 4He–4He interactomic potentials is found in this work.