We report a laboratory measurement of absolute emission cross sections of both the Lyman bands (B 1:I.;i -x 1:I.t) and Werner bands (C •nu-X •ntl of H 2 by electron impact over the energy range from threshold to 400 eV with the same optical system. We find the emission cross section for the B 1:I.;i -x 1:I.t transition at 100 eV to be (3.55±0.8)X 10-17 cm2 (2.7 X w17 em\ direct excitation, 0.85...

The impact parameter formalism of the single-center close-coupling, first-, and second-order Born approximations have been applied to investigate direct excitations of Helium He+(2s) and Lithium Li++(2s) ions by colliding with protons or antiprotons. The total 3s, 3p, and 3d scaled excitation cross sections are calculated in the scaled impact energy region (2 to 1000 keV). The present work aims...