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Radiative stabilization in double-electron capture to 4ℓ4ℓ' and 4ℓ5ℓ' states in O 6+

par Van Der Hart, Hugo W.;Vaeck, Nathalie ;Hansen, Jørgen J.E.
Référence Journal of Physics. B, Atomic Molecular and Optical Physics, 27, 15, page (3489-3514)
Publication Publié, 1994-08

Article révisé par les pairs

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Résumé :

Following slow collisions between O 8+ and Ar, double-electron capture into 4ℓ4ℓ' and 4ℓ5ℓ' states of O 6+ has been reported. The experimental results show that in 25% of the events the two electrons are retained on the oxygen presumably due to radiative stabilization. In order to understand this high rate of stabilization, we have calculated for the first time the decay properties of all the 4ℓ4ℓ' and 4ℓ5ℓ' terms in the isolated atom using a truncated diagonalization method with B-spline basis sets. The 4ℓ4ℓ' states are lying in the same range of energy as the higher members of the 3ℓnℓ' Rydberg series and we have extended our B-spline approach to represent accurately the 3ℓnℓ' states with n up to 50. In this static approach, we obtain 30.8% radiative stabilization for the 4ℓ4ℓ' manifold and 2.6% for the 4ℓ5ℓ' manifold assuming in both cases a statistical population of the states. We conclude that these values, when combined with the experimentally determined initial populations of the two configurations, are too small to explain the experimental features assuming a statistical population distribution and we propose that in order to clarify the situation an experimental and/or theoretical study of the population distribution over the two configurations is necessary. © 1994 IOP Publishing Ltd.