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. 2017 Jul 3;7:4528. doi: 10.1038/s41598-017-04667-9

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Schematic diagram of core-level photoemission in Ag₅Pb₂O₆. A Pb-dominant character is assumed for the conduction electrons in the diagram. A Coulomb interaction between a Pb core hole and Pb conduction electrons generates electron-hole pairs in the E _F-crossing band.