We measured the 2E1 decay of the 1s2s 1S0 →1s2 1S0 transition in He-like germanium for 12- to 19-MeV/u Ge31+ +H2 collisions. The resonant population of the 2s2p 1P1 state by transfer excitation was isolated due to its cascading to the 1s2s 1S0 state. The experimental cross sections compare well with calculations using dielectronic recombination rates. The method gives the unique possibility to populate selectively the 1S0 state in heavy He-like ions.
P. H. Mokler et al., "Single Transfer-Excitation Resonance Observed Via the Two-Photon Decay in He-like Ge30+," Physical Review Letters, vol. 65, no. 25, pp. 3108-3111, American Physical Society (APS), Dec 1990.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.65.3108
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