title: K-shell photoabsorption edge of strongly coupled matter driven by laser-converted radiation.
abstract: The first observation of the K-shell photoabsorption edge of strongly coupled matter with an ion-ion coupling parameter of about 65 generated by intense x-ray radiation-driven shocks is reported. The soft x-ray radiation generated by laser interaction with a "dog bone" high-Z hohlraum is used to ablate two thick CH layers, which cover a KCl sample, to create symmetrical inward shocks. While the two shocks impact at the central KCl sample, a highly compressed KCl is obtained with a density of 3-5 times solid density and a temperature of about 2-4 eV. The photoabsorption spectra of chlorine near the K-shell edge are measured with a crystal spectrometer using a short x-ray backlighter. The redshift of the K edge up to 11.7 eV and broadening of 15.2 eV are obtained for the maximum compression. A comparison of the measured redshifts and broadenings with dense plasma calculations are made, and it indicates potential improvements in the theoretical description.
authors.affiliation: Research Center of Laser Fusion, China Academy of Engineering Physics, P. O. Box 919-986, Mianyang 621900, People's Republic of China.
authors.forename: Yang
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authors.lastname: Zhao
authors.forename: Jiamin
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authors.forename: Chaoguang
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authors.forename: Yu
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authors.lastname: Mei
authors.forename: Ruizhen
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authors.forename: Shaoen
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authors.forename: Shenye
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authors.lastname: Liu
authors.forename: Yongkun
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authors.lastname: Ding
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authors.lastname: Zhang