Temperature measurements of shocked crystals by use of nanosecond X-ray diffraction

TY - GEN

T1 - Temperature measurements of shocked crystals by use of nanosecond X-ray diffraction

AU - Murphy, William J.

AU - Higginbotham, Andrew

AU - Wark, Justin S.

AU - Park, Nigel

PY - 2007/12/1

Y1 - 2007/12/1

N2 - Over the past few years we have been pioneering the use of sub-nanosecond X-ray diffraction to determine the phase and compression of shocked crystals. It is well known that the deviation of atoms from their ideal lattice sites due to thermal motion reduces the integrated intensity within diffraction peaks - the so-called Debye-Waller effect, and thus it is pertinent to investigate whether line ratios might be sufficiently sensitive to be used as a viable temperature diagnostic. Clearly the matter is not completely straight-forward, as the Debye frequency of a solid also varies under compression. In our initial investigations we have calculated the ratios of intensities of high-order reflections assuming various forms of the Grüneisen parameter, and have also compared these results with those obtained from Molecular Dynamics simulations. Given the photon energies of nanosecond X-ray pulses that can currently be produced, we comment on the experimental feasibility of the technique.

AB - Over the past few years we have been pioneering the use of sub-nanosecond X-ray diffraction to determine the phase and compression of shocked crystals. It is well known that the deviation of atoms from their ideal lattice sites due to thermal motion reduces the integrated intensity within diffraction peaks - the so-called Debye-Waller effect, and thus it is pertinent to investigate whether line ratios might be sufficiently sensitive to be used as a viable temperature diagnostic. Clearly the matter is not completely straight-forward, as the Debye frequency of a solid also varies under compression. In our initial investigations we have calculated the ratios of intensities of high-order reflections assuming various forms of the Grüneisen parameter, and have also compared these results with those obtained from Molecular Dynamics simulations. Given the photon energies of nanosecond X-ray pulses that can currently be produced, we comment on the experimental feasibility of the technique.

KW - Shock

KW - Temperature

KW - X-ray diffraction

UR - http://www.scopus.com/inward/record.url?scp=71849108591&partnerID=8YFLogxK

U2 - 10.1063/1.2833045

DO - 10.1063/1.2833045

M3 - Conference contribution

AN - SCOPUS:71849108591

SN - 9780735404694

VL - 955

SP - 325

EP - 328

BT - AIP Conference Proceedings

T2 - 15th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter, SCCM 2007

Y2 - 24 June 2007 through 29 June 2007

ER -