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Title: Optical probe investigation of laser ablated carbon plasma plume in nitrogen ambient

We report the study of carbon plasma produced using 1064 nm laser in nitrogen ambient at atmospheric pressure using 2-dimensional fast imaging of ablated plume, optical emission spectroscopy, and optical probe at 532 nm for interferometry and shadowgraphy. The dominance of C{sub 2} and CN molecules over ionic species at later stages of expanding carbon plasma plume is reported. The observed ring structure in shadowgrams and change in the direction of fringe shift from positive to negative in recorded interferograms are correlated with the relative abundance of different species in the plasma plume as function of time delay with respect to ablating pulse. An agreement in observed onset time of formation of clusters/atomic species or low ionic species using different diagnostic techniques has been reported.
Authors:
; ;  [1]
  1. Department of Physics, Indian Institute of Technology Kanpur, Kanpur-208016 Uttar Pradesh (India)
Publication Date:
OSTI Identifier:
22218386
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 12; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABLATION; ATOMIC CLUSTERS; CARBON; CYANIDES; EMISSION SPECTROSCOPY; INTERFEROMETRY; LASERS; MOLECULES; NITROGEN; PLASMA DIAGNOSTICS; PLASMA PRODUCTION; TIME DEPENDENCE; TWO-DIMENSIONAL CALCULATIONS; VISIBLE RADIATION