Comparative study of pulsed laser ablated plasma plumes from single crystal graphite and amorphous carbon targets. Part II. Electrostatic probe measurements
| Autor: | R.M. Mayo, Jagdish Narayan, A. K. Sharma, J. W. Newman, Yukihiko Yamagata |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 88:6868-6874 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.1321784 |
| Popis: | In an ongoing effort to investigate plasma plume features yielding high quality diamond-like carbon films, we have applied plasma plume diagnosis and film characterization to examine plume character distinction from KrF laser ablation of both amorphous carbon (a-C) and single crystal graphite (SCG) targets. The advancing plasma plume produced by these structurally different targets are observed to possess quantitatively similar total heavy particle inventory, ionized fraction, and electron thermal content, yet quite different ion kinetic energy, plume profile, C2 formation mechanism, and concentration of complex molecules. Plume electron temperatures are observed to reside in the range 1–3 eV, with those in SCG plumes ∼10%–30% greater than a-C at all spatial positions downstream of the target. For both target cases, we find Te drop off with position away from the target with radiation as the most likely loss mechanism for these noninteracting plumes propagating in vacuum. Electron density is found to be ∼... |
| Databáze: | OpenAIRE |
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