Cesium oxalate under extreme conditions: Theory and experiment

ORAL

Abstract

We have investigated structural changes of cesium oxalate and cesium oxalate monohydrate under extreme conditions. Absorption of sufficiently energetic X-ray photons by a molecular system results in a cascade of ultrafast electronic relaxation processes which leads to a distortion and dissociation of its molecular structure. It is found that there is a distinct difference between cesium oxalate and cesium oxalate monohydrate when exposed to x-ray and high pressure conditions. X-ray induced degradation of powdered cesium oxalate monohydrate occurred under high pressure, leading to the formation of a new compound while no dramatic change was observed in case of cesium oxalate when subjected to the same extreme conditions. Our combined theory and experimental study suggests that the presence of water molecules in initially solid-state systems is important for such X-ray induced photochemistry when combined with applied high pressure.

*We gratefully acknowledge support from the U. S. Department of Energy, the Basic Energy Sciences program under Award Number DE-SC0023248. This work was supported in part by the State of Nevada UNLV Foundation Catalyst grant (AWD-02-00001154). A portion of this work was performed at HPCAT (Sector 16), APS, Argonne National Laboratory. HPCAT operations are supported by DOE-NNSA's Office of Experimental Sciences. The Advanced Photon Source is a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. E. E. and P. K. B. sincerely acknowledge the financial support of an industrial sponsored project supported by Koshee Company, Las Vegas, USA. E. K. acknowledges that her research was performed using funding received from the DOE Office of Nuclear Energy's Nuclear Energy University Program under Award Number DE-NE0008788.

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Presenters

  • Eunja Kim

    • The University of texas at El Paso (UTEP)

Authors

  • Eunja Kim

    • The University of texas at El Paso (UTEP)

  • Egor Evlyukhin

    • UNLV

  • Petrika Cifligu

    • UNLV

  • Michael Pravica

    • UNLV

  • Pradip Bhowmik

    • UNLV

  • Dmitry Popov

    • HPCAT, X-ray Science Division, Argonne National Laboratory
    • High-pressure Collaborative Access Team, X-ray Science Division, Argonne National Laboratory, Argonne, IL 60439, USA

  • Changyong Parks

    • Argonne National Laboratory
    • HPCAT, X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA