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Solid state effects in the NEXAFS spectra of alkane-based van der Waals crystals: Breakdown of molecular model
 

Summary: Solid state effects in the NEXAFS spectra of alkane-based van der
Waals crystals: Breakdown of molecular model
Y. Zou, T. Araki, G. Appel 1
, A.L.D. Kilcoyne 2
, H. Ade *
Department of Physics, North Carolina State University, Raleigh, NC 27695, United States
Received 31 May 2006; in final form 24 August 2006
Available online 30 August 2006
Abstract
Experimental data conclusively shows that the weak van der Waals interactions between alkane molecules, <1.5% the strength of
covalent bonding on a per carbon atom basis, modify the carbon 1s near edge X-ray absorption fine structure (NEXAFS) spectrum sig-
nificantly in ordered solids, both in intensity, spectral shape, peak position, and dichroic signature. This constitutes a further breakdown
of the `building block' model, or, more precisely, even a molecular model in interpreting NEXAFS spectra. These observations have
significant implications for the interpretation and use of NEXAFS spectra from any crystalline or semi-crystalline macromolecules, small
molecules, or other weakly interacting systems.
2006 Elsevier B.V. All rights reserved.
Over the last two decades, near edge X-ray absorption
fine structure spectroscopy (NEXAFS) has evolved into a
powerful characterization tool for a number of materials
and systems. The NEXAFS of the carbon 1s absorption

  

Source: Ade, Harald W.- Department of Physics, North Carolina State University

 

Collections: Physics