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arxiv 0910.1051 v1 pith:W5HSEIG5 submitted 2009-10-06 cond-mat.mtrl-sci

Identifying structural order in Selenium with Near-Edge Spectroscopy

J. A. McLeod , N. Chen , R. E. Johanson , G. Belev , D. Tonchev , A. Moewes , S. O. Kasap This is my paper
classification cond-mat.mtrl-sci
keywords absorptioncrystallineorderstructurex-rayamorphousphaseselenium
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We investigate the crystallization of amorphous arsenic-selenium alloys with 0%, 0.5%, 2%, 6%, 10%, and 19% arsenic by atomic concentration using synchrotron X-ray absorption spectroscopy. We identify crystalline order using the extended X-ray absorption fine structure (EXAFS) spectra and correlate this order to changes in features of the X-ray absorption near edge structure (XANES) spectra. We find supporting evidence that the structure of amorphous selenium is composed of disordered helical chains, and is therefore closer to the trigonal crystalline phase than the monoclinic crystalline phase.

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