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Title: Expansion dynamics of ultrafast laser produced plasmas in the presence of ambient argon

In this paper, we report the emission features of fs laser ablated brass plasma plumes at various Ar background pressure levels ranging from vacuum to atmospheric conditions. Spectrally integrated 2D-imaging of plasma self-emission showed several interesting features at various pressure levels which consists of plume morphological changes, increase in persistence, confinement, and internal structures. Spatially resolved wavelength dispersed images of the plume were recorded for characterizing the spectral features at various pressure levels and also used for obtaining spatial distribution of Cu I and Zn I species in the plume, signal to noise ratios and fundamental parameters of the plasma; viz. temperature and density. The spatial evolution of excitation temperature and density showed significant changes at various ambient pressure levels and these results were correlated to morphological changes seen in the plume images. Optimum signal to background ratios for emission lines were observed in the moderate pressure range (~ 1-10 Torr). Optical time-of-flight profiles were used to study time evolution of various species in the plume and noticed oscillations at intermediate pressure levels. Possible mechanisms for observed changes in plume shape, optical emission intensity, and dual peak structures in time-of-flight profiles were discussed.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Purdue Univ., West Lafayette, IN (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Report Number(s):
PNNL-SA-107307
Journal ID: ISSN 0021-8979; NN2001000
Grant/Contract Number:
AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 116; Journal Issue: 13; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ultrafast laser ablation; laser produced plasma; LIBS; plasma hydrodynamics; emission
OSTI Identifier:
1167613

Diwakar, P. K., Harilal, Sivanandan S., Hassanein, A., and Phillips, Mark C.. Expansion dynamics of ultrafast laser produced plasmas in the presence of ambient argon. United States: N. p., Web. doi:10.1063/1.4896169.
Diwakar, P. K., Harilal, Sivanandan S., Hassanein, A., & Phillips, Mark C.. Expansion dynamics of ultrafast laser produced plasmas in the presence of ambient argon. United States. doi:10.1063/1.4896169.
Diwakar, P. K., Harilal, Sivanandan S., Hassanein, A., and Phillips, Mark C.. 2014. "Expansion dynamics of ultrafast laser produced plasmas in the presence of ambient argon". United States. doi:10.1063/1.4896169. https://www.osti.gov/servlets/purl/1167613.
@article{osti_1167613,
title = {Expansion dynamics of ultrafast laser produced plasmas in the presence of ambient argon},
author = {Diwakar, P. K. and Harilal, Sivanandan S. and Hassanein, A. and Phillips, Mark C.},
abstractNote = {In this paper, we report the emission features of fs laser ablated brass plasma plumes at various Ar background pressure levels ranging from vacuum to atmospheric conditions. Spectrally integrated 2D-imaging of plasma self-emission showed several interesting features at various pressure levels which consists of plume morphological changes, increase in persistence, confinement, and internal structures. Spatially resolved wavelength dispersed images of the plume were recorded for characterizing the spectral features at various pressure levels and also used for obtaining spatial distribution of Cu I and Zn I species in the plume, signal to noise ratios and fundamental parameters of the plasma; viz. temperature and density. The spatial evolution of excitation temperature and density showed significant changes at various ambient pressure levels and these results were correlated to morphological changes seen in the plume images. Optimum signal to background ratios for emission lines were observed in the moderate pressure range (~ 1-10 Torr). Optical time-of-flight profiles were used to study time evolution of various species in the plume and noticed oscillations at intermediate pressure levels. Possible mechanisms for observed changes in plume shape, optical emission intensity, and dual peak structures in time-of-flight profiles were discussed.},
doi = {10.1063/1.4896169},
journal = {Journal of Applied Physics},
number = 13,
volume = 116,
place = {United States},
year = {2014},
month = {10}
}