Charge-exchange x-ray spectra: Evidence for significant contributions from radiative decays of doubly excited states

Ali, R.; Beiersdorfer, P.; Harris, C. L.; Neill, P. A.

doi:10.1103/PhysRevA.93.012711

Title: Charge-exchange x-ray spectra: Evidence for significant contributions from radiative decays of doubly excited states

Journal Article · Thu Jan 21 00:00:00 EST 2016 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.93.012711· OSTI ID:1400100

Ali, R. ^[1]; Beiersdorfer, P. ^[2]; Harris, C. L. ^[3]; Neill, P. A. ^[4]

Univ. of Jordan, Amman (Jordan). Dept. of Physics
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Gulf Coast State College, Panama City, FL (United States). Natural Sciences Division
Univ. of Nevada, Reno, NV (United States). Dept. of Physics

Charge-exchange collisions of slow Ne¹⁰⁺ ions with He, Ne, and Ar targets were studied with simultaneous x-ray and cold-target recoil-ion-momentum spectroscopy proving the contribution of several mechanisms to the radiative stabilization of apparent (4,4) doubly excited states for He and Ne targets and of (5,6) states for Ar. In particular, the stabilization efficiency of the mechanism of dynamic auto-transfer to Rydberg states is confirmed. Moreover, we present evidence for direct radiative decays of (4,4) states populated in collisions with He, which is an experimental indication of the population of so-called unnatural-parity states in such collisions. Lastly, these mechanisms lead to the emission of x-rays that have considerably higher energies than those predicted by current spectral models and may explain recent observations of anomalously large x-ray emission from Rydberg levels.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE; National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1400100

Alternate ID(s):: OSTI ID: 1235608

Report Number(s):: LLNL-JRNL-664892; PLRAAN; TRN: US1703226

Journal Information:: Physical Review A, Vol. 93, Issue 1; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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