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Differential scattering cross sections are measured for He + N_2, O_2, CO, and NO, using the crossed molecular beams technique. These data, which are sensitive to the van der Waals attractive minima and adjacent regions of the intermolecular potentials, are analyzed in terms of both central‐field and anisotropic models. Little evidence is found for quenching of the observed diffraction oscillations, and anisotropic contributions are determined to be small: the spherical averages of these anisotropic potentials are indistinguishable, within experimental error, from the potentials obtained by a central‐field analysis. This study thus provides a quantitative, empirical validation of the central‐field assumption for molecular scattering in weakly anisotropic systems.

Scattering of thermal He beams by crossed atomic and molecular beams. III. Anisotropic intermolecular potentials for He + N2, O2, CO, and NO