26 May 1998 Evolution of the free plasma expansion in jets produced by laser ablation
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Proceedings Volume 3404, ALT'97 International Conference on Laser Surface Processing; (1998) https://doi.org/10.1117/12.308625
Event: ALT '97 International Conference on Laser Surface Processing, 1997, Limoges, France
Abstract
The free expansion evolution of cooper plasma produced by laser ablation is studied by the analysis of the angular distribution and space evolution of the deposition rate and time-of-flight measurements (TOF). The angular distribution of the neutral and ionic species is mainly frontal, but the angular distribution of the neutral species is broader than that of the ionic species. The total number of species, ion dose and most probable ion energy (by solid angle) show no evolution at distances between 7 and 15 cm of the target indicating a global free molecular expansion. The TOF measurements show that the energy distribution of plasma species is different in different directions. Using the Saenger approximation it has been calculated the temperature and velocity of the different ions present in the plume. An increase of the species temperature in the plasma expansion has been observed. The different results obtained by the global measurements and TOF measurements are discussed analyzing the limitation of the Saenger's model and considering the electron-ion coulombic interactions.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
F. Orieux, C. de Julian, Dominique Givord, "Evolution of the free plasma expansion in jets produced by laser ablation", Proc. SPIE 3404, ALT'97 International Conference on Laser Surface Processing, (26 May 1998); doi: 10.1117/12.308625; https://doi.org/10.1117/12.308625
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