2024-03-28T18:49:21Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1695592018-09-12T00:57:11Zcom_10261_66com_10261_3col_10261_319
00925njm 22002777a 4500
dc
Gutiérrez, A.
author
López, María Francisca
author
1995-08
Amorphous 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.
Europhysics Letters 31(5-6): 299-303 (1995)
0295-5075
http://hdl.handle.net/10261/169559
10.1209/0295-5075/31/5-6/009
1286-4854
First Experimental Evidence of a C-1s Core Exciton in Amorphous Carbon Films