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| Title: | Characterization of a laser-ablation-assisted-plasma-discharge-metallic ion source |
| Authors: | Lash, J S
Gilgenbach, R. M.
Spindler, H L |
| Issue Date: | 1-Nov-1995 |
| Publisher: | IOP Publishing Ltd |
| Citation: | Lash, J S; Gilgenbach, R M; Spindler, H L (1995). "Characterization of a laser-ablation-assisted-plasma-discharge-metallic ion source." Plasma Sources Science and Technology. 4(4): 511-515. <http://hdl.handle.net/2027.42/49189> |
| Abstract: | Experiments have been carried out to characterize further the properties of a new laser-ablation-assisted-plasma-discharge source of metallic aluminium ions. Laser ablation is accomplished by focusing a KrF excimer laser (<1.2 J, 40 ns, 248 nm) onto a solid aluminium target with a fluence of approximately 10 J cm-2. Through gated optical emission spectroscopy, the laser ablation plume optical emission is observed to contain only aluminium neutral atom transitions after approximately 100 ns. With the application of a 3.6 kV, 760 A discharge, the neutral atom plume is transformed into a plasma with the emission dominated by Al+ and Al2+ ion transitions. Through time-resolved spectroscopy, emission intensity from the Al neutral species and the Al2+ ion species is observed to coincide with current peaks through the plasma. Spectroscopic measurements indicate an Al2+ electronic temperature of 3 eV (and an Al+ electronic temperature of 1 eV) which, since local thermodynamic equilibrium (LTE) is applicable for the observed emission, provide a free electron temperature of 1 to 3 eV. A simple LTE model suggests an electron temperature of 1.2 eV for equal Al+ and Al2+ ion fractions. A floating double Langmuir probe measurement 1 mm in front of the laser ablation spot indicates an electron temperature of roughly 1 eV and an ion density of approximately 5*1014 cm-3 during the second current lobe. |
| URI: | http://hdl.handle.net/2027.42/49189 |
| ISSN: | 0963-0252 |
| Other Identifiers: | 10.1088/0963-0252/4/4/001 |
| Appears in Collections: | Nuclear Engineering and Radiological Sciences, Department of (NERS)
Interdisciplinary and Peer-Reviewed
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| ps950401.pdf | | 379Kb | Adobe PDF | View/Open |
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