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Spins and microstructure of hydrogenated amorphous carbon : A multiple frequency electron paramagnetic resonance study
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- Von, Bardeleben H.J. (author)
- Von Bardeleben, H.J., Groupe de Physique des Solides, Universités Paris 6 And 7, UMR 75-88 au CNRS, 2 place Jussieu, 75251 Paris Cedex 05, France
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- Cantin, J.L. (author)
- Groupe de Physique des Solides, Universités Paris 6 And 7, UMR 75-88 au CNRS, 2 place Jussieu, 75251 Paris Cedex 05, France
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- Zeinert, A. (author)
- Université de Picardie, LPMC, 33rue St. Leu, F-80038 Amiens, France
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- Hai, P.N. (author)
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- Von Bardeleben, HJ., Groupe de Physique des Solides, Universités Paris 6 And 7, UMR 75-88 au CNRS, 2 place Jussieu, 75251 Paris Cedex 05, France Groupe de Physique des Solides, Universités Paris 6 And 7, UMR 75-88 au CNRS, 2 place Jussieu, 75251 Paris Cedex 05, France (creator_code:org_t)
- AIP Publishing, 2001
- 2001
- English.
- In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 78:19, s. 2843-2845
- Journal article (peer-reviewed)
Abstract
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- Polymer-like and diamond-like hydrogenated amorphous carbon films, characterized by high spin concentrations of 1020 cm-3, have been studied by multiple frequency electron paramagnetic resonance (EPR) spectroscopy at 9, 35, and 94 GHz. Whereas the low-frequency measurements show only one single symmetric EPR line, the high-frequency measurements reveal the anisotropic nature of the g tensor. They show the presence of two different paramagnetic centers with anisotropic g tensors of g?(1) = 2.005, g?(1) ˜ 2.003, and g?(2) = 2.010, g?(2) ˜ 2.003. We attribute both to localized p states on nanosized sp2 graphitic clusters. The g? values of the g tensors, which are correlated to the size of the graphite like carbon clusters, indicate two different cluster sizes with values below 50 Å. © 2001 American Institute of Physics.
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