Double excitation of helium atoms by impact of protons and highly charged ions

The impact parameter version of the four body-symmetric Eikonal approximati on (SE2) is introduced to study double excitation of dielectronic atoms by heavy ions at high impact energies. The total cross sections are calculated for double excitation to the 2p(2) (D-1) state and the sum of the 2p(2) (D -1) and 2s2p(P-1) states of helium atoms by impact of protons, Cq+ (q=4-6) and Fq+ (q=7-9) ions. Theoretical results are compared with measurements an d other existing calculations.