Solid state effects in the NEXAFS spectra of alkane-based van der Waals crystals: Breakdown of molecular model |
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Authors: | Y. Zou T. Araki G. Appel A.L.D. Kilcoyne H. Ade |
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Affiliation: | aDepartment of Physics, North Carolina State University, Raleigh, NC 27695, United States |
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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 significantly 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. |
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