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Jager, C.; Gottwald, J.; Spiess, H.W.; Newport, Robert J. (1994)
Publisher: American Physical Society
Languages: English
Types: Article
Subjects: Q

Classified by OpenAIRE into

arxiv: Condensed Matter::Strongly Correlated Electrons
Our NMR studies give experimental evidence of bonding heterogeneity in samples of a-C:H on the nanometer scale. Two classes of protons were identified with distinctly different spin-lattice-relaxation behavior. The difference in the spin-lattice relaxation provides a means of spectral editing of cross-polarization magic-angle spinning, combined rotation and multiple-pulse spectroscopy, dipolar dephasing spectra, and multiple quantum NMR experiments. This combination of the various NMR techniques allows for a detailed structural investigation of a-C:H, e.g., the sp2:sp3 ratio, the relative amount of hydrogenated and nonhydrogenated carbons, etc. A model incorporating the heterogeneity is established and discussed. The NMR results are compared with neutron spectroscopy and diffraction data.
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