This Letter reports the first measurements of the angular distribution of Auger electrons emitted from the decay of the (1s2s2p2)3D O4+** doubly excited state formed predominantly through resonant transfer and excitation (RTE) in collisions of 13-MeV O5+ projectiles with He. The (1s2s2p2)3D angular distribution is strongly peaked along the beam direction, in agreement with recent calculations of the RTE angle-dependent impulse approximation. Furthermore, interference effects between the RTE and the elastic target direct-ionization channels are observed.
M. Benhenni et al., "Angular Distribution of Auger Electrons Emitted through the Resonant Transfer and Excitation Process Following O5++He Collisions," Physical Review Letters, vol. 65, no. 15, pp. 1849-1852, American Physical Society (APS), Oct 1990.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.65.1849
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