Direct ionization processes of hydrogen-like atoms by proton impact are investigated by Born theory. The triple differential cross sections (TDCSs) and the quantities of physical interest in the process are calculated for ionization of H, He⁺, Li²⁺, and Be³⁺ ground-state atoms, using the first- and second-Born approximations. The closure relation is employed to come over the consideration of the intermediate states. The calculations are carried for fixed scattering angles and ejected electron energies at the impact energies 75, 200, and 500 keV. The influence of each of the incidence energy and the atomic number of the target atom on the TDCSs is studied. The contribution of the second-Born term to the cross section is illustrated.

玻恩理论研究了质子撞击下类氢原子的直接电离过程。使用第一玻恩和第二玻恩近似，计算H，He ⁺，Li ²⁺和Be ³⁺基态原子的电离三重微分截面（TDCSs）和过程中的物理关注量。封闭关系用于克服中间状态的考虑。计算是针对固定散射角和以75 keV，200 keV和500 keV的冲击能量喷射的电子能量。研究了入射能量和目标原子的原子序数对TDCS的影响。示出了第二出生项对横截面的贡献。