Abstract
The As-F compounds AsF3, AsF5 and AsF6 − have very large absorption peaks at the onset of the As K absorption edge. These peaks are due to a large density of unfilled 4p states associated with the As-F anti-bonding levels. As shown in Fig. 1(a) the position and shape of the peaks can be used to identify the absorbing species. In addition, since the 4p states are associated with the As-F bonds the strength of the transition depends on the orientation of the molecule with respect to the x-ray polarization direction. In the similar case of the Br2 molecule this polarization dependence has already been demonstrated to have the same cos2θ dependence as the EXAFS [1]. Therefore, measurements of the As XANES in AsF5-graphite intercalation compounds can be used to identify the As species present, and in some cases the orientation of the molecules.
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© 1983 Springer-Verlag Berlin Heidelberg
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Heald, S.M., Goldberg, H.A., Kalnin, I.L. (1983). Application of XANES to the Study of AsF5-Graphite Intercalation Compounds. In: Bianconi, A., Incoccia, L., Stipcich, S. (eds) EXAFS and Near Edge Structure. Springer Series in Chemical Physics, vol 27. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-50098-5_26
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DOI: https://doi.org/10.1007/978-3-642-50098-5_26
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