Time-resolved observation of structural change of copper induced by laser shock using synchrotron radiation with dispersive XAFS

ABSTRACT

We report a single-shot nanosecond time-resolved dispersive XAFS measurement of copper foil under laser-induced shock compression. Obtained EXAFS results indicated clearly the structural evolution, though XANES spectra showed that the laser irradiation does not affect the copper electronic state. The nearest (ca. 0.22 nm) and longer (ca. 0.44 nm) Cu–Cu distances are changed at 4 and 200 ns, respectively, in the radial structure functions (RSFs). It was revealed that an average compression of 2% occurs at 4 ns and is released within 200 ns. It was found that the fragmentation of the copper begins at around 200 ns according to the increase in distance of the RSF.

KEYWORDS:

• Dispersive XAFS
• compression
• laser shock
• copper

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

A part of this research done by YN, KT and MK was carried out with the support of the Cross-ministerial Strategic Innovation Promotion Program – Unit D66 – Innovative Measurement and Analysis for Structural Materials (SIP-IMASM). The XAFS study was carried out under the approval of PF-PAC No. [2013PF-22] and [2014G067].