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Título

First Experimental Evidence of a C-1s Core Exciton in Amorphous Carbon Films

AutorGutiérrez, A.; López, María Francisca
Fecha de publicaciónago-1995
EditorEDP Sciences
CitaciónEurophysics Letters 31(5-6): 299-303 (1995)
ResumenAmorphous carbon films obtained by pulsed-laser ablation of graphite have been investigated by high-resolution x-ray absorption spectroscopy (XAS). The onset of the 1s → σ* transitions lies in the gap between π* and σ* states in graphite, indicating a high content of sp3 hybridization in the films. A sharp peak similar to the core exciton in diamond is observed and assigned to a core exciton in sp3-hybridized disordered C atoms. The observed binding-energy shift of ~ 0.5 eV with respect to the diamond core exciton can be explanined in terms of a higher localization of the excited state induced by disorder. This result supports a Frenkel model to describe the core exciton in sp3-hybridized carbon.
Versión del editorhttps://doi.org/10.1209/0295-5075/31/5-6/009
URIhttp://hdl.handle.net/10261/169559
DOI10.1209/0295-5075/31/5-6/009
ISSN0295-5075
E-ISSN1286-4854
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