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T Antiproton–hydrogen Atom Collision at Intermediate Energy

ion–atom collision processes is important in atomic physics. It helps us fundamentally understand particle interactions and the corresponding dynamics for applications in many subfields, such as fusion sciences, astrophysics, and material sciences. Furthermore, it presents an interesting problem as the basic physics. Energetic collision of two particles can produce processes; for example, ion– atom collisions frequently produce elastic scattering, electronic excitation, charge transfer, and ionization. An accurate description of the electrons’ behavior during the collision is essential to better understand the dynamics and precisely determine cross sections for these processes. To investigate the collision dynamics in detail, we must observe how the electronic state varies as the incident ion nears the target atom. Because measuring various observables as a function of the collision time is difficult, numerical simulation of the collision process is the only way to “see” the instantaneous collision, so it has attracted much attention.1,2 The simulation study must also include effective visualization schemes. We study the dynamics of ionization in antiproton–hydrogen collisions using a molecularorbital close-coupling (MOCC) method.1 We present the numerical result using a simulation technique to visualize the ionization and better understand the collision dynamics.