ABSTRACT
The ORNL ion-atom merged-beams apparatus has measured benchmark electron capture cross sections for the multicharged ion N2+ on H(and D) from 0.1 eV/u to 4445 eV/u (Marc Pieksma, M. E. Bannister, W. Wu, and C. C. Havener, to be published Physical Review A, July (1997)). For collision energies less than 200 eV/u the new data are in reasonable accord with recent fully quantal calculations of Herrero et al. (J. Phys. B 28 711 (1995)), except that the experiment provides no evidence for the existence of a peak in the cross section at 0.25 eV/u. Additional structure between 10 and 100 eV/u (Bienstock et al. PRA 17, 2078 (1986)) is not observed either. Between 200 and 2000 eV/u the present results are some 30% below the previously published experimental (hydrogen furnace) and theoretical cross sections, and a local maximum is found near 200 eV/u, instead of 360 eV/u. A possible explanation of the discrepancy with previous experiment is that the hydrogen furnace contains\ed H2 in vibrationally excited states which could have lead to a larger H signal after background subtraction.
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Last modified by Charles Havener on April 23, 1997