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

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Univ. of Jordan, Amman (Jordan). Dept. of Physics
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Gulf Coast State College, Panama City, FL (United States). Natural Sciences Division
  4. Univ. of Nevada, Reno, NV (United States). Dept. of Physics
Publication Date:
Report Number(s):
LLNL-JRNL-664892
Journal ID: ISSN 2469-9926; PLRAAN
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 93; Journal Issue: 1; Journal ID: ISSN 2469-9926
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE; National Aeronautic and Space Administration (NASA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1400100
Alternate Identifier(s):
OSTI ID: 1235608