A mechanism for the selective population of 1s2s2p PJ4 states by electron capture in energetic collisions of F7+ (1s2s S3) ions with H2 and He is elucidated. Capture calculations indicate (1s2s S3) nl L 2,4 doublet and quartet levels to be approximately evenly populated for n=2-5. Following capture the doublets Auger decay strongly to the 1 s2 ground state allowing for negligible feeding of other lower-lying doublets by radiative transitions. The quartets, however, find this decay channel blocked by spin conservation and instead radiatively cascade through lower lying quartets, eventually strongly populating the lowest-lying 1s2s2p PJ4 levels in agreement with older experimental results for collision energies above 0.7 MeV/u.
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|Publication status||Published - May 9 2008|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics