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An Analytic X-Ray Absorption Near-Edge Spectroscopy Model for Compressed Fe<sub>2</sub>O<sub>3</sub>

POSTER

Abstract

Understanding various electronic and magnetic changes at high pressures in Fe2O3 is not only an important solid-state physics question, but is crucial in describing Earth’s lower mantle. An x-ray absorption platform is being developed at the Laboratory for Laser Energetics to understand the electronic and crystal structure of compressed materials by simultaneously measuring x-ray absorption near edge spectroscopy (XANES) and extended x-ray absorption fine structure. Fe2O3 was quasi-ramp compressed up to 700 GPa and the pressure was determined using a velocity interferometry system for any reflector (VISAR) on the OMEGA-60 laser. An analytic method to extract the electronic occupation and temperature of the compressed sample from the XANES edge is being developed and compared to electronic structure calculations from ab initio molecular-dynamics simulations based on density function theory.

Presenters

  • Matthew E Signor

    University of Rochester

Authors

  • Matthew E Signor

    University of Rochester

  • D. A Chin

    University of Rochester, Laboratory for Laser Energetics, University of Rochester

  • Philip M Nilson

    Lab for Laser Energetics, Laboratory for Laser Energetics, University of Rochester

  • David T Bishel

    University of Rochester

  • Ethan Smith

    University of Rochester

  • Xuchen Gong

    Lab for Laser Energetics

  • Mary Kate Ginnane

    University of Rochester

  • Brian Henderson

    University of Rochester Laboratory for Laser Energetics, University of Rochester

  • Danae Polsin

    Laboratory for Laser Energetics, University of Rochester

  • Suxing Hu

    Laboratory for Laser Energetics, University of Rochester, LLE, University of Rochester, Lab. for Laser Energetics, U. of Rochester

  • J. Ryan Rygg

    University of Rochester, Laboratory for Laser Energetics, University of Rochester

  • Gilbert W Collins

    University of Rochester Laboratory for Laser Energetics, University of Rochester, University of Rochester, Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester

  • John J Ruby

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Amy L Coleman

    Lawrence Livermore Natl Lab

  • Federica Coppari

    Lawrence Livermore Natl Lab

  • Yuan Ping

    Lawrence Livermore Natl Lab

  • Reetam Paul

    University of Rochester

  • Marion Harmand

    Sorbonee Université, Sorbonne University