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Resonant Raman scattering of amorphous carbon and polycrystalline diamond films

Resonante Ramanstreuung an amorphen Kohlenstoff- und polykristallinen Diamantfilmen
 
: Koidl, P.; Ramsteiner, M.; Wagner, J.; Wild, C.

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Physical Review. B 40 (1989), No.3, pp.1817-1824 : Abb.,Lit.
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
ISSN: 2469-9950
English
Journal Article
Fraunhofer IAF ()
amorpher Kohlenstoff; amorphous carbon; polycrystalline diamond; polykristalliner Diamant; resonant Raman scattering; resonante Ramanstreuung

Abstract
Resonant Raman scattering has been used to study amorphous carbon and polycrystalline diamond films. The incident photon energies were varied over the range 2.2-4.8 eV. In hydrogenated amorphous carbon films containing both sp high 3 and sp high 2 bonded carbon, a high-frequency shift is interpreted in terms of scattering from pi-bonded carbon clusters which is resonantly enhanced for photon energies approaching the pi-pi resonance of sp high 2 bonded carbon. In polycrystalline diamond films excitation with photon energies equal or bigger than 3.0 eV enhances the Raman signal from sp high 3 bonded diamond phase relative to the scattering by sp high 2 bonded carbon and with respect to the underlying broadband luminescence. The Raman band arising from scattering by sp high 2 bonded carbon shows a high-frequency shift with increasing photon energy for energies equal or bigger than 3.0 eV. Possible models for the structure of this sp high 2 bonded carbon phase are discussed on the basis of the present Raman data.

: http://publica.fraunhofer.de/documents/PX-31841.html