Abstract

In elastic atom-atom collisions resonances can be formed even for zero angular momentum, provided that the potential has a barrier. It is shown that their contribution in the cross section is much larger than expected from their energy width. This is due to an unusually large broadening effect in the angular momentum variable which only occurs for zero-angular-momentum resonances. The broadening effect in the partial waves is analyzed, and it is shown how such resonances affect the cross sections.

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