Classical ensemble model of three-body collisions in the point contact approximation and application to alignment effects in near-resonant energy transfer collisions of He atoms with Rydberg Ca atoms

An ensemble model representing three-body energy transfer collision in heavy particle within the fermi point contact approximation is presented. The model determines the number differential cross sections for transitions between initial and final states defined in terms of energy, magnitude and projection of angular momentum. Spatial constraints and angular momentum for small quantum numbers is examined. The model demonstrated the alignment phenomena collisions for rare-gas atoms when applied to Ca and He energy transfer process.