L-shell resonant transfer and excitation in niobium ions

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Abstract
We have calculated L-shell cross sections for the process of resonant transfer excitation followed by x-ray stabilization (RTEX) in collisions of Nbq+ ions (q=28–32) with H2. The LMn plateau cross section is nearly constant [(4.5–5.2)×10−20 cm2] for q=29–32 and is consistent with the results of the recent experiment by Bernstein et al. [Phys. Rev. A 40, 4085 (1989)] for q=31 and 32, but our results for q=28–30 are substantially larger than experiment. For Ne-like niobium (q=31), the inclusion of RTEX contributions from higher transitions (LNn, LOn, etc.) leads to good agreement with the experiment by Bernstein et al. in the high-energy tail. This implies that only a small contribution is possible from the uncorrelated transfer excitation process.