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A wavelet analysis for the X-ray absorption spectra of molecules

Lookup NU author(s): Professor Thomas Penfold

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Abstract

We present a Wavelet transform analysis for the X-ray absorption spectra of molecules. In contrast to the traditionally used Fourier transform approach, this analysis yields a 2D correlation plot in both R- and k-space. As a consequence, it is possible to distinguish between different scattering pathways at the same distance from the absorbing atom and between the contributions of single and multiple scattering events, making an unambiguous assignment of the fine structure oscillations for complex systems possible. We apply this to two previously studied transition metal complexes, namely iron hexacyanide in both its ferric and ferrous form, and a rhenium diimine complex, [ReX(CO)₃(bpy)], where X = Br, Cl, or ethyl pyridine (Etpy). Our results demonstrate the potential advantages of using this approach and they highlight the importance of multiple scattering, and specifically the focusing phenomenon to the extended X-ray absorption fine structure (EXAFS) spectra of these complexes. We also shed light on the low sensitivity of the EXAFS spectrum to the Re-X scattering pathway.

Publication metadata

Author(s): Penfold TJ, Tavernelli I, Milne CJ, Reinhard M, ElNahhas A, Abela R, Rothlisberger U, Chergui M

Publication type: Article

Publication status: Published

Journal: Journal of Chemical Physics

Year: 2013

Volume: 138

Issue: 1

Print publication date: 07/01/2013

Online publication date: 03/01/2013

Acceptance date: 06/12/2013

ISSN (print): 0021-9606

ISSN (electronic): 1089-7690

Publisher: American Institute of Physics Publishing

URL: http://dx.doi.org/10.1063/1.4772766

DOI: 10.1063/1.4772766

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