Plasma dynamics from laser ablated solid lithium |
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Authors: | Debarati Bhattacharya |
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Institution: | (1) Institute for Plasma Research, Bhat, 382 428 Gandhinagar, India;(2) Present address: Nuclear Science Centre, Aruna Asaf Ali Marg, Post Box No. 10502, 110 067 New Delhi, India |
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Abstract: | Emission plasma plume generated by pulsed laser ablation of a lithium solid target by a ruby laser (694 nm, 20 ns, 3 J) was
subjected to optical emission spectroscopy: time and space resolved optical emission was characterised as a function of distance
from the target surface. Propagation of the plume was studied through ambient background of argon gas. Spectroscopic observations
can, in general, be used to analyse plume structure with respect to an appropriate theoretical plasma model. The plume expansion
dynamics in this case could be explained through a shock wave propagation model wherein, the experimental observations made
were seen to fit well with the theoretical predictions. Spectral information derived from measurement of peak intensity and
line width determined the parameters, electron temperature (T
e) and electron number density (n
e), typically used to characterise laser produced plasma plume emission. These measurements were also used to validate the
assumptions underlying the local thermodynamic equilibrium (LTE) model, invoked for the high density laser plasma under study.
Some interesting results pertaining to the analysis of plume structure and spatio-temporal behaviour of T
e and n
e along the plume length will be presented and discussed. |
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Keywords: | Laser ablation plasma dynamics optical emission spectroscopy |
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