Molecular beam scattering

The molecular beam technique was used in three different experimental arrangements to study a wide range of inter-atomic and molecular forces. Results of a low energy (0.2 kcal/mole) elastic scattering study of the He-Ar pair potential are reported. The purpose of the study was to accurately characterize the shape of the potential in the well region, by scattering slow He atoms produced by expanding a mixture of He in N2 from a cooled nozzle. Measurements of the vibrational predissociation spectra and product translation energy for clusters of water, benzene, and ammonia are given. The experiments show that most of the product energy remains in the internal moleclar motions. HCl yields NaCl, +H at collision energies of 5.38 and 19.4 kcal/mole are presented. Computer programs written to analyze molecular beam expansions are described.