Measurements of ionization states in warm dense aluminum with betatron radiation.

Autor:	Mo MZ; Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada, T6G 2V4., Chen Z; Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada, T6G 2V4., Fourmaux S; INRS-EMT, Université du Québec, 1650 Lionel Boulet, Varennes, Quebéc, Canada, J3X 1S2., Saraf A; INRS-EMT, Université du Québec, 1650 Lionel Boulet, Varennes, Quebéc, Canada, J3X 1S2., Kerr S; Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada, T6G 2V4., Otani K; INRS-EMT, Université du Québec, 1650 Lionel Boulet, Varennes, Quebéc, Canada, J3X 1S2., Masoud R; Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada, T6G 2V4., Kieffer JC; INRS-EMT, Université du Québec, 1650 Lionel Boulet, Varennes, Quebéc, Canada, J3X 1S2., Tsui Y; Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada, T6G 2V4., Ng A; Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada, V6T 1Z1., Fedosejevs R; Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada, T6G 2V4.
Jazyk:	angličtina
Zdroj:	Physical review. E [Phys Rev E] 2017 May; Vol. 95 (5-1), pp. 053208. Date of Electronic Publication: 2017 May 19.
DOI:	10.1103/PhysRevE.95.053208
Abstrakt:	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. 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.
Databáze:	MEDLINE
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