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NEXAFS multiple scattering calculations of KO_2

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Pedio, Maddalena and Wu, Z. Y. and Benfatto, M. and Mascaraque Susunaga, Arantzazu and Michel, E. and Crotti, C. and Peloi, M. and Comicioli, C. (2001) NEXAFS multiple scattering calculations of KO_2. Journal of synchrotron radiation, 8 (2). pp. 719-721. ISSN 0909-0495

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Official URL: http://dx.doi.org/10.1107/S0909049501000206


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Abstract

Since many years the oxidation of alkali metals has being attracted much interest due to the catalytic properties of metal promoters and the simple electronic structure of alkali atoms. The alkali-oxides phase diagram indicates that the interaction of oxygen with alkali metals can lead to the formation of different atomic O2- ions and molecular O_2 and O^(2-) ions. Potassium superoxide has been prepared in situ and high resolution O k-edge absorption NEXAFS spectra have been measured at the VUV beam-line at ELETTRA facility. The experimental data have been analyzed by multiple scattering approach deriving many geometrical and electronic details. In particular, we have found that the growth material structure is of the KO_2 type with an O-O distance of about 1.35 Angstrom and that the transition involving single pi molecular empty state of the superoxide O_2^(2-) anion has a fine structure. Multiple Scattering self consistent calculation indicates that the bond between oxygen anion and K atom is totally ionic and that the fine structure is essentially due to solid state effects.


Item Type:Article
Additional Information:

© 2001 International Union of Crystallography.
International Conference on X-ray Absorption Fine Structure (XAFS XI) (11. 2000. AKO, Japón).

Uncontrolled Keywords:Spectra, Cesium
Subjects:Sciences > Physics > Materials
ID Code:28489
Deposited On:19 Feb 2015 09:26
Last Modified:19 Feb 2015 09:26

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