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EnglishHydrogenated amorphous carbon films were irradiated at room temperature both with ion beams and laser pulses. Ion irradiation was performed with 300 keV Ar+ ions at current densities of about 1 muA cm-2 and the average density release was of about 10(24)-10(25) eV cm-3, while laser irradiation was performed with a Ruby laser (0.694 mum) with an energy flow of 0.1-1.2 J cm-2 and an energy release of about 10(22) eV cm-3. The electronic and atomic structure of irradiated layers were investigated by optical measurements in the range 1-6 eV and Raman spectroscopy in the region of C-C stretching modes (1000-2000 cm-1). It was found that laser irradiation shows a stronger efficiency with respect to ion beam bombardment in the modification of the film structure. Moreover Raman spectroscopy shows a progressive growth of the trigonal carbon component with respect to the tetrahedral one with increasing energy deposited inside the sample. The differences between ion and photon energy release mechanisms and a comparison with thermal processes are discussed in terms of primary interaction with the molecular constituents of the samples.
| Titolo: | COMPARISON BETWEEN PULSED-LASER AND ION IRRADIATION OF HYDROGENATED AMORPHOUS-CARBON FILMS | |
| Autori interni: | ||
| Data di pubblicazione: | 1994 | |
| Rivista: | ||
| Abstract: | Hydrogenated amorphous carbon films were irradiated at room temperature both with ion beams and laser pulses. Ion irradiation was performed with 300 keV Ar+ ions at current densities of about 1 muA cm-2 and the average density release was of about 10(24)-10(25) eV cm-3, while laser irradiation was performed with a Ruby laser (0.694 mum) with an energy flow of 0.1-1.2 J cm-2 and an energy release of about 10(22) eV cm-3. The electronic and atomic structure of irradiated layers were investigated by optical measurements in the range 1-6 eV and Raman spectroscopy in the region of C-C stretching modes (1000-2000 cm-1). It was found that laser irradiation shows a stronger efficiency with respect to ion beam bombardment in the modification of the film structure. Moreover Raman spectroscopy shows a progressive growth of the trigonal carbon component with respect to the tetrahedral one with increasing energy deposited inside the sample. The differences between ion and photon energy release mechanisms and a comparison with thermal processes are discussed in terms of primary interaction with the molecular constituents of the samples. | |
| Handle: | http://hdl.handle.net/20.500.11769/3279 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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