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V. SIVAKUMARAN, AJAI KUMAR, R. K. SINGH, V. PRAHLAD, H. C. JOSHI. Atomic Processes in Emission Characteristics of a Lithium Plasma Plume Formed by Double-Pulse Laser Ablation[J]. Plasma Science and Technology, 2013, 15(3): 204-208. DOI: 10.1088/1009-0630/15/3/02
Citation: V. SIVAKUMARAN, AJAI KUMAR, R. K. SINGH, V. PRAHLAD, H. C. JOSHI. Atomic Processes in Emission Characteristics of a Lithium Plasma Plume Formed by Double-Pulse Laser Ablation[J]. Plasma Science and Technology, 2013, 15(3): 204-208. DOI: 10.1088/1009-0630/15/3/02

Atomic Processes in Emission Characteristics of a Lithium Plasma Plume Formed by Double-Pulse Laser Ablation

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  • Received Date: January 26, 2012
  • High resolution spectral analysis of lithium plasma formed by single and double laser ablation has been undertaken to understand the plume-laser interaction, especially at the early stages of the plasma plume. In order to identify different atomic processes in evolving plasma, time resolved spectral emission studies at different inter-pulse delays have been performed for ionic and neutral lithium lines emitting from different levels. Along with the enhancement in emission intensity, a large line broadening and spectral shift, especially in the case of excited state transition Li I 610.3 nm have been observed in the presence of the second pulse. This broadening and shift gradually decrease with increasing time delay. Another interesting feature is the appearance of a multi-component structure in the ionic line at 548.4 nm and these components change conversely into a single structure at the later stages of the plasma. The multi-component structures are correlated with the presence of di®erent velocity (temperature) distributions in non-LTE conditions. Atomic analyses by computing photon emissivity coe±cients with an ADAS code have been used to identify the above processes.
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