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Title: Measurements of ionization states in warm dense aluminum with betatron radiation

Time-resolved measurements of the ionization states of warm dense aluminum via K-shell absorption spectroscopy are demonstrated using betatron radiation generated from laser wakefield acceleration as a probe. The warm dense aluminum is generated by irradiating a free-standing nanofoil with a femtosecond optical laser pulse and was heated to an electron temperature of ~20–25 eV at a close-to-solid mass density. Absorption dips in the transmitted x-ray spectrum due to the Al 4+ and Al 5+ ions are clearly seen during the experiments. The measured absorption spectra are compared to simulations with various ionization potential depression models, including the commonly used Stewart-Pyatt model and an alternative modified Ecker-Kröll model. Furthermore, the observed absorption spectra are in approximate agreement with these models, though indicating a slightly higher state of ionization and closer agreement for simulations with the modified Ecker-Kröll model.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [2] ;  [3] ;  [2] ;  [3] ;  [4] ;  [3]
  1. Univ. of Alberta, Edmonton, AB (Canada); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Univ. du Quebec, Varennes, QC (Canada)
  3. Univ. of Alberta, Edmonton, AB (Canada)
  4. Univ. of British Columbia, Vancouver, BC (Canada)
Publication Date:
Grant/Contract Number:
AC02-76SF00515; 2014-05736
Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 95; Journal Issue: 5; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1368691