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Observation of dynamical substate mixing of fast ions in solids

By Dominique Vernhet, J.-P. Rozet, I. Bailly-Despiney, C. Stephan, A. Cassimi, J.-P. Grandin and L. J Dubé


International audienceUsing 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, 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 field-induced Stark mixing of degenerate n,l,j substates. Within this model, the values obtained for the electric field 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

Topics: quantum transport, ion-solid collisions
Publisher: HAL CCSD
Year: 1998
DOI identifier: 10.1088/0953-4075
OAI identifier: oai:HAL:hal-00004987v1
Provided by: Hal-Diderot
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