title: Extended X-ray absorption fine structure measurements of laser-shocked V and Ti and crystal phase transformation in Ti.
abstract: 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 approximately 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 alpha-Ti to omega-Ti crystal phase transformation, known to occur below approximately 0.1 Mbar for slower shock waves.
authors.affiliation: Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA.
authors.forename: B
authors.initials: B
authors.lastname: Yaakobi
authors.forename: D D
authors.initials: DD
authors.lastname: Meyerhofer
authors.forename: T R
authors.initials: TR
authors.lastname: Boehly
authors.forename: J J
authors.initials: JJ
authors.lastname: Rehr
authors.forename: B A
authors.initials: BA
authors.lastname: Remington
authors.forename: P G
authors.initials: PG
authors.lastname: Allen
authors.forename: S M
authors.initials: SM
authors.lastname: Pollaine
authors.forename: R C
authors.initials: RC
authors.lastname: Albers