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Observation of dynamical substate mixing of fast ions in solids

Abstract : Using high-resolution x-ray spectroscopy, we have measured, as a function of target thickness, the relative intensities of the fine-structure components of the Balmer alpha line emitted by fast hydrogen-like krypton ions (33.2 MeV u(-1) Kr35+) propagating through thin carbon and copper targets. Our results are in clear disagreement with the predictions of a rate-equation model accounting for collisional l mixing. On the other hand, good agreement is found with a model taking solely into account a wake held-induced Stark mixing of degenerate n, l, j substates. Within this model, the values obtained for the electric held agree well with those deduced from measured total stopping power, which indicates that the effect of core electrons must be considered. Furthermore, off-diagonal density matrix elements of the initial capture process to the n = 3 states are inferred from the experimental intensities. A comparison, for carbon targets, with available (gas-phase) calculations of these matrix elements, reveals important differences.
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Contributor : Suzanne Robert <>
Submitted on : Monday, April 17, 2000 - 4:39:18 PM
Last modification on : Monday, January 4, 2021 - 1:22:03 PM


  • HAL Id : in2p3-00022982, version 1



Dominique Vernhet, J.P. Rozet, I. Baillydespiney, C. Stephan, A. Cassimi, et al.. Observation of dynamical substate mixing of fast ions in solids. Journal of Physics B: Atomic, Molecular and Optical Physics, IOP Publishing, 1998, 31, pp.117-129. ⟨in2p3-00022982⟩



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