Interaction of Low-Energy Positrons with Atoms and Molecules

该项目主要研究低能正电子与原子和分子的相互作用，使用高分辨率，基于陷阱的正电子束和互补技术来研究散射和湮灭过程。要研究的正电子碰撞散射过程包括分子的振动激发、电子激发、电离、正电子形成以及原子和分子中的共振现象。重点将放在高能量分辨率的测量和低正电子能量值的研究上，包括对各种近阈值过程的研究。虽然该项目侧重于原子物理学的研究，但在许多领域具有更广泛的影响。从实验的策划到研究成果的传播，这项研究在各个层面都积极涉及研究生和博士后研究人员，包括代表性不足的群体成员。

This project focuses on the interaction of low-energy positrons with atoms and molecules, using a high-resolution, trap-based positron beam and complementary techniques to study scattering and annihilation processes. Positron-impact scattering processes to be studied include the vibrational excitation of molecules, and electronic excitation, ionization, positronium formation, and resonance phenomena in both atoms and molecules. Emphasis will be placed upon high energy-resolution measurements and studies at low values of positron energy, including the investigation of a variety of near-threshold processes. While focusing on research in atomic physics, this project has broader impacts in a number of areas. This research actively involves graduate students and post-doctoral researchers, including members of underrepresented groups, at all levels from the planning of experiments to the dissemination of research results.