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Chinese Physics C> 2013, Vol. 37> Issue(3) : 038003 DOI: 10.1088/1674-1137/37/3/038003

Local hydrated structure of an Fe2+/Fe3+ aqueous solution: an investigation using a combination of molecular dynamics and X-ray absorption fine structure methods

  • The hydrated shell of both Fe2+ and Fe3+ aqueous solutions are investigated by using the molecular dynamics (MD) and X-ray absorption structure (XAS) methods. The MD simulations show that the first hydrated shells of both Fe2+ and Fe3+ are characterized by a regular octahedron with an Fe-O distance of 2.08Å for Fe2+ and 1.96Å for Fe3+, and rule out the occurrence of a Jahn-Teller distortion in the hydrated shell of an Fe2+ aqueous solution. The corresponding X-ray absorption near edge fine structure (XANES) calculation successfully reproduces all features in the XANES spectra in Fe2+ and Fe3+ aqueous solution. A feature that is located at energy 1 eV higher than the white line (WL) in an Fe3+ aqueous solution may be assigned to the contribution of the charge transfer.
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YE Qing, CHEN Xing, ZHOU Jing, ZHAO Hai-Feng, CHU Wang-Sheng, ZHENG Xu-Sheng and WU Zi-Yu. Local hydrated structure of an Fe2+/Fe3+ aqueous solution: an investigation using a combination of molecular dynamics and X-ray absorption fine structure methods[J]. Chinese Physics C, 2013, 37(3): 038003. doi: 10.1088/1674-1137/37/3/038003
YE Qing, CHEN Xing, ZHOU Jing, ZHAO Hai-Feng, CHU Wang-Sheng, ZHENG Xu-Sheng and WU Zi-Yu. Local hydrated structure of an Fe2+/Fe3+ aqueous solution: an investigation using a combination of molecular dynamics and X-ray absorption fine structure methods[J]. Chinese Physics C, 2013, 37(3): 038003.  doi: 10.1088/1674-1137/37/3/038003 shu
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Received: 2012-04-27
Revised: 2012-08-14
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Local hydrated structure of an Fe2+/Fe3+ aqueous solution: an investigation using a combination of molecular dynamics and X-ray absorption fine structure methods

    Corresponding author: CHEN Xing,
    Corresponding author: WU Zi-Yu,
  • Received Date: 2012-04-27
  • Accepted Date: 2012-08-14
  • Available Online: 2013-03-05

Abstract: The hydrated shell of both Fe2+ and Fe3+ aqueous solutions are investigated by using the molecular dynamics (MD) and X-ray absorption structure (XAS) methods. The MD simulations show that the first hydrated shells of both Fe2+ and Fe3+ are characterized by a regular octahedron with an Fe-O distance of 2.08Å for Fe2+ and 1.96Å for Fe3+, and rule out the occurrence of a Jahn-Teller distortion in the hydrated shell of an Fe2+ aqueous solution. The corresponding X-ray absorption near edge fine structure (XANES) calculation successfully reproduces all features in the XANES spectra in Fe2+ and Fe3+ aqueous solution. A feature that is located at energy 1 eV higher than the white line (WL) in an Fe3+ aqueous solution may be assigned to the contribution of the charge transfer.

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