Linear Dichroism in the NEXAFS Spectra of n-Alkane Crystalline Polymorphs
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Linear Dichroism in Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy is a useful tool for studying molecular orientation and for clarifying spectroscopic assignments. n- Alkane molecules can form single crystals with different polymorphs; orthorhombic and monoclinic in the case of even chain lengths between n-C28H58 and n-C40H82. These polymorphs exhibit different linear dichroism in their NEXAFS spectra; in particular a backbone-oriented transition contributes to the low-energy “C-H” band in the monoclinic polymorph.
CitationSahan D. Perera, Jian Wang and Stephen G. Urquhart, 2018, Linear Dichroism in the NEXAFS Spectra of N-Alkane Crystalline Polymorphs, J. Electron Spectrosc. and Rel. Phen., 232, 5-10. DOI: 10.1016/j.elspec.2018.12.004