Fully differential cross sections for ionization of H(2s) atoms by proton and antiproton impact

Abstract

The fully differential cross sections (FDCSs) for ionization of hydrogen atoms, being initially in the 2s excited state, by proton and antiproton impacts are calculated in the framework of the second Born approximation. The closure relation is employed to perform the summation over the intermediate states in the second Born approximation. The calculations are performed for emission of the electron in both scattering and perpendicular planes. The dependence of calculations on the projectile's charge is investigated at different impact energies and at small scattering angles where the significant contribution to the total cross section originates. It is noticed that the influence of the electric projectile's charge on the FDCSs in the perpendicular plane is much greater than it is in the scattering plane, and it increases as the scattering angle decreases. Finally, we calculate the doubly differential cross section (DDCS) for proton-induced reactions.

Second Born fully differential cross sections for direct ionization of H(1s) by proton and antiproton collisions

“…0one, and it decreases with increasing the impact energy. A comparison with similar calculations for H(2s) atoms[15], illustrates that the structure of the fully…”

“…Nassar and Tantawi[15] applied a closured second-order Born approximation to calculate the fully differential cross sections for ionization of hydrogen atoms, initially in the 2s excited state, by proton and antiproton impact. Calculations were performed for electron emission in both the scattering and perpendicular planes.…”

Positronium formation for positron scattering from metastable hydrogen

“…In recent years, the excitation and ionization processes of metastable hydrogen in 2s state by positron impact and many other scattering processes by electron, proton, and anti-proton impact have attracted considerable interests and abundant phenomena were found. [7][8][9][10] The Ps formation process of the metastable hydrogen has not been extensively investigated so far.…”