Coincidences between two sulfur K x rays were detected from collisions of hydrogenlike S ions with H2 gas in the projectile energy range between 150 and 225 MeV. These K x rays are emitted in the decay of doubly excited states formed in the collisions via transfer and excitation. The excitation function for two coincident Kβ transitions peaks at about 175 MeV, slightly above the expected KMM resonance energy for resonant transfer and excitation (RTE). This demonstrates the occurrence of ΔN≥2 transitions (i.e., KMM and higher resonances) in the RTE process. The cross sections for the population of the very highly excited states are higher than those predicted by theoretical calculations that use dielectronic recombination rates folded with the Compton profile for the bound electrons.
R. S. Schuch and E. L. Justiniano and M. Schulz and S. Datz and P. F. Dittner and J. P. Giese and H. F. Krause and H. Schone and C. R. Vane and S. M. Shafroth, "Population of Highly Excited Intermediate Resonance States by Electron Transfer and Excitation," Physical Review A, vol. 43, no. 9, pp. 5180-5183, American Physical Society (APS), May 1991.
The definitive version is available at https://doi.org/10.1103/PhysRevA.43.5180
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