Quantum-mechanical description of ionization, capture, and excitation in proton collisions with atomic oxygen - art. no. 052710

The basis generator method is used to propagate effective single-particle e quations for ion-atom collisions to provide a mean-field description for th e proton-oxygen collision system. The pure capture and ionization as well a s transfer ionization cross sections are calculated using two alternative p rescriptions to extract the physical information from the propagated orbita ls. The sensitivity of the resonant single capture cross section to the eff ective single-particle potential for atomic oxygen is tested. Cross section s are calculated for 1-2000 keV proton impact and good overall agreement is found with available experiments, while some of the results are at varianc e with a recent model calculation. The single-particle excitation amplitude s are combined in the LS coupling scheme to obtain excitation cross section s for particular atomic oxygen configurations. The latter are compared with recent measurements for proton and electron impact. Reasonable agreement i s found for many one-electron excitations and some two-electron processes.