Triply excited states formed in metastable ion-atom collisions

M. Zamkov, P. Richard, H. Tawara
J.R. Macdonald Lab, Kansas State University

E.P. Benis, T.J.M. Zouros
Univ. of Crete, Heraklion, Crete, Greece
& J.R. Macdonald Lab, Kansas State University

We report the measurement of the absolute double differ- ential cross section for the production of the triply excited 2s2p2 2D state of B2+ formed in B3+(ls2s 3S) + H2 collisions. The states are formed by double excitation plus capture in two independent steps. In the first step, one k-vacancy was produced by stripping the initial B2+(1s22s 2S) beam to a B3+(1s2s 3S) ion beam component in a carbon foil. The resulting fraction of B3+(1s2s 3S) metastable ions has been determined. In the second step, the metastable beam collided with a hydrogen target to form the triply excited 2s2p2 2D by RTE from0 B3+(ls2s 3S). The RTEA cross section has been measured for a wide range of projectile energies using zero degree Auger spectroscopy. Resonant behavior of the ls2s 3S to 2s2p2 2D transition has been observed and compared with theory.

This work was supported by the Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy.

Submitted to DAMOP/DAMP Meeting, May 2001 in London, Ontario.

This abstract is also available in Postscript or Adobe Acrobat formats.

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