HR: 0852h
AN: MR11A-04    [Abstracts]
TI: Simple Molecular Systems Under Simultaneous Conditions of High Pressure and Temperature
AU: * Goncharov, A
EM: goncharov@gl.ciw.edu
AF: Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015, United States
AB: Knowledge of the elastic, optical and vibrational properties of materials under extreme conditions of high pressure and temperature is crucial for interpreting the results of seismological and planetary observations, for materials science, and for improving our understanding of fundamental physics and chemistry under such conditions. Here, I will present the results of Raman and optical spectroscopy (in pulsed and continuous modes), and also x-ray diffraction measurements of simple molecular materials under conditions of high static pressure and temperature in the diamond anvil cell. High temperatures were generated mainly by laser heating (including a pulsed laser heating), but also using internal and external resistive heating. The behavior of hydrogen, deuterium, nitrogen, oxygen and water under simultaneous conditions of high temperature and high static pressure up to 120 GPa and 4000 K will be reported. The results reveal unexpected routes of transformation to nonmolecular materials and establish the behavior of interatomic interactions in molecular materials. I thank the following individuals for contributing to this work: J. Crowhurst, N. Goldman, L. Fried, C. Mundy, J. Zaug, R. J. Hemley, V. V. Struzhkin, P. Beck, C.-S. Zha, E. Gregoryanz, C. Sanloup, M. Somayazulu, Y. Meng, N. Guignot, M. Mezouar. I acknowledge support by DOE/BES, DOE/NNSA (CDAC), NSF, and the W. M. Keck Foundation.
DE: 3924 High-pressure behavior
DE: 3934 Optical, infrared, and Raman spectroscopy
DE: 3954 X-ray, neutron, and electron spectroscopy and diffraction
DE: 3994 Instruments and techniques
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting