Experimental and theoretical cross sections for electron-impact excitationof the 2s -> 2p transition in O5+ - art. no. 042713

Experimental and R-matrix calculated cross sections are reported for the re sonance 2s-->2p transition in O5+. Use is made in the measurements of the e lectron-energy-loss technique, with center-of-mass interaction energies in the range 10.5 (below threshold) through 12.0 (threshold) to 17.0 eV. The p resent results are in good agreement with calculations using the R matrix w ith pseudostates theory, which includes nine physical states and 18 pseudos tates. They are also in good agreement with near-threshold data of Bell et al. [Phys. Rev. A 49, 4585 (1994)], and with a 41-state calculation of Grif fin et al.