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Phys. Rev. Lett. 92, 095504 (2004) [4 pages]

Extended X-Ray Absorption Fine Structure Measurements of Laser-Shocked V and Ti and Crystal Phase Transformation in Ti

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B. Yaakobi, D. D. Meyerhofer, and T. R. Boehly
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA

J. J. Rehr
Department of Physics, University of Washington, Seattle, Washington 98195, USA

B. A. Remington, P. G. Allen, and S. M. Pollaine
Lawrence Livermore National Laboratory, Livermore, California 94550, USA

R. C. Albers
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Received 23 October 2003; published 5 March 2004

Extended x-ray absorption fine structure (EXAFS), using a laser-imploded target as a source, can yield the properties of laser-shocked metals on a nanosecond time scale. EXAFS measurements of vanadium shocked to ∼0.4   Mbar yield the compression and temperature in good agreement with hydrodynamic simulations and shock-speed measurements. In laser-shocked titanium at the same pressure, the EXAPS modulation damping is much higher than is warranted by the predicted temperature increase. This is shown to be due to the α-Ti to ω-Ti crystal phase transformation, known to occur below ∼0.1   Mbar for slower shock waves.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.92.095504
DOI: 10.1103/PhysRevLett.92.095504
PACS: 62.50.+p, 61.10.Ht, 61.80.Ba, 64.70.Kb

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