Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2012-01-05
Chemical Physics 237, 295 (1998)
Physics
Condensed Matter
Soft Condensed Matter
11 pages, 7 figures, 1 table, http://www.sciencedirect.com/science/article/pii/S0301010498002626
Scientific paper
10.1016/S0301-0104(98)00262-6
The electronic structure of the poly-pyridine conjugated polymer has been investigated by resonant and nonresonant inelastic X-ray scattering and X-ray absorption spectroscopies using synchrotron radiation. The measurements were made for both the carbon and nitrogen contents of the polymer. The analysis of the spectra has been carried out in comparison with molecular orbital calculations taking the repeat-unit cell as a model molecule of the polymer chain. The simulations indicate no significant differences in the absorption and in the non-resonant X-ray scattering spectra for the different isomeric geometries, while some isomeric dependence of the resonant spectra is predicted. The resonant emission spectra show depletion of the {\pi} electron bands in line with symmetry selection and momentum conservation rules. The effect is most vizual for the carbon spectra; the nitrogen spectra are dominated by lone pair n orbital emission of {\sigma} symmetry and are less frequency dependent.
Ågren Hans
Agui A.
Guo J.- H.
Horsburgh L. E.
Johansson Niklas
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