HYDROGEN EXCITATION BY ANTIPROTON AND MULTICHARGED-ION IMPACT

Electron excitation by multicharged ions colliding with hydrogen targets is calculated with the prior eikonal impulse approximation. Cross sections for excitation to n = 2 and 3 by impact of antiprotons (pBAR), protons (p), He2+, Be4+, and O6+, are reported as well as the density matrix elements, multipole expansion parameters, dipole moments and perihelion velocities. The present theory gives a good account of the available experiments and compares well with other sophisticated theoretical methods in the intermediate energy range (25 greater-than-or-equal-to E/Z(P) greater-than-or-equal-to 200 keV).