High Resolution Study on Highly Excited Rydberg H Atom Scattering with He

a high resolution study of the high-n rydberg h atom scattering with helium was carried out using the h atom rydberg tagging time-of-flight technique. differential cross sections were measured for scattering process of h (n) + he -> h (n') + he at the collision energy of 0. 526 ev. experimental result indicates that the scattered h (n') product is mainly forward distributed, with signals observed in the wide range of angles at the sideway and forward scattering directions. at the sideway and forward directions, a lot of oscillatory structures in the angular distributions are present. detailed analysis also shows that the principle quantum number, n, is not changed much for the rydberg h atom at the forward scattering direction. this work provides a good test ground to investigate theoretically the exact collision dynamics between the high-n rydberg h atom and the helium atom.