One- and two-K-shell vacancy production in atomic Li by 95-MeV/u [Formula Presented] projectiles

J. A. Tanis, J. Y. Chesnel, F. Frémont, D. Hennecart, X. Husson, D. Lecler, A. Cassimi, J. P. Grandin, J. Rangama, B. Skogvall, B. Sulik, J. H. Bremer, N. Stolterfoht

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Abstract

Singly and doubly K-shell-vacant states in atomic Li, produced by 95-MeV/u [Formula Presented] projectiles, have been investigated. At this high velocity, excitation and ionization are expected to be well described by perturbation theories. High-resolution spectra for Auger electron emission, occurring in the energy range ∼50–90 eV and resulting from the deexcitation of singly or doubly excited states, were measured for various electron emission angles. Both single-K-shell excitation and double-K-shell vacancy production show strong dependences on the electron emission angle. Experimental anisotropy parameters for the [Formula Presented] states resulting from single-K-shell excitation are in good agreement with predictions of the Born approximation. In the case of double-K-shell-vacancy (i.e., hollow atom) production, the two K vacancies are found to come about mainly by ionization plus excitation of the atomic Li target giving rise to excited states in [Formula Presented] Strong line intensities from the [Formula Presented] and [Formula Presented] excited-state configurations are explained in terms of shake processes, providing direct spectral identification for the electron-electron (e-e) interaction in producing the doubly vacant K-shell configurations. Production of the [Formula Presented] state, which has an intensity greater than that of the [Formula Presented] state, is attributed to a three-electron transition involving two shake transitions. Production of the [Formula Presented] state has a large contribution from the dielectronic manifestation of the e-e interaction resulting from slow electron emission.

Original languageEnglish
Number of pages1
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume62
Issue number3
DOIs
Publication statusPublished - Jan 1 2000

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Tanis, J. A., Chesnel, J. Y., Frémont, F., Hennecart, D., Husson, X., Lecler, D., Cassimi, A., Grandin, J. P., Rangama, J., Skogvall, B., Sulik, B., Bremer, J. H., & Stolterfoht, N. (2000). One- and two-K-shell vacancy production in atomic Li by 95-MeV/u [Formula Presented] projectiles. Physical Review A - Atomic, Molecular, and Optical Physics, 62(3). https://doi.org/10.1103/PhysRevA.62.032715