Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)

A 12.5: Poster

Donnerstag, 5. April 2001, 12:30–15:00, AT3

EXCITED STATE FORMATION DURING ELECTRON CAPTURE BY 0.8 - 6 keV GROUND STATE BEAMS OF C2+, N2+, AND O2+ IN H AND H2. — •D.M. Kearns, D.R. Gillen, D. Voulot, R.W. McCullough, and H.B. Gilbody — The Atomic and Molecular Physics Research Division, The School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, N. Ireland, UK

The formation of excited states during electron capture collisions by low energy (<25keV/amu) multiply charged ions is an important process in astrophysical environments and in technological plasmas. At impact velocities less than 1 au the electron capture process results in the formation of a relatively small number of excited product states. We have demonstrated in previous work that the presence of metastable states in the primary ion beam can strongly influence the final excited state populations. Double translational energy spectroscopy (DTES) can be used to provide measurements of partial cross sections for state prepared ion beams.

We have carried out DTES measurements for one electron capture by 50 - 500 eV/amu ground state doubly charged ions of C, N, and O in H and H2. These measurements are compared with currently available theoretical models showing good agreement for the major capture channels, but some disagreement for minor channels.