Valeri I. Babushok,
Frank C. DeLucia, Jr.,
Paul J. Dagdigian,
Michael J. Nusca,
and Andrzej W. Miziolek
V. I. Babushok is with the National Institute of Standards and Technology, Gaithersburg, Maryland 20899.
F. C. DeLucia, Jr., M. J. Nusca, and A. W. Miziolek are with the U.S. Army Research Laboratory, AMSRL-WM-BD, Aberdeen Proving Ground, Maryland 21005-5069.
P. J. Dagdigian (pjdagdigian@jhu.edu) is with the Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218-2685.
Valeri I. Babushok, Frank C. DeLucia, Paul J. Dagdigian, Michael J. Nusca, and Andrzej W. Miziolek, "Kinetic modeling of the laser-induced breakdown spectroscopy plume from metallic lead," Appl. Opt. 42, 5947-5962 (2003)
We report initial results of a study aimed toward developing a computational fluid dynamics (CFD) model to simulate the laser-induced breakdown spectroscopy (LIBS) plume for the purpose of understanding the physical and chemical factors that control the LIBS signature. The kinetic model developed for modeling studies of the LIBS plume from metallic lead includes a set of air reactions and ion chemistry as well as the oxidization, excitation, and ionization of lead atoms. At total of 38 chemical species and 220 reactions are included in the model. Experimental measurements of the spatial and temporal dependence of a number of lead emission lines have been made of the LIBS plume from metallic lead. The mechanism of generation of excited Pb states in the LIBS plume is analyzed through kinetic modeling and sensitivity analysis. Initial CFD model results for the LIBS plume are presented.
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In Tables
1
–
5, = denotes a reversible process whereas => indicates an irreversible process. Rate constant k [cm, s, mol] is expressed in Chemkin format as ATn
exp[- E/RT].
In Tables
1
–
5, for termolecular processes the relative collision efficiencies for specific third bodies, when available, are given in the line below the process.
Lifetime of the line emission from the LIBS plume; uncertainties are 1σ values.
Lifetime of the concentration of the upper state computed in the kinetic model (initial conditions the same as for Fig.
7).
Table 8
Effect of Environmental Gas on the Production of Pb Excited Atomic States
Initial mixture, air + 9% H2O + the stated Pb mole fraction; initial temperature, 15,000 K.
Temperature 1/e decay time, 25 µs.
Temperature 1/e decay time, 5 µs.
In Tables
1
–
5, = denotes a reversible process whereas => indicates an irreversible process. Rate constant k [cm, s, mol] is expressed in Chemkin format as ATn
exp[- E/RT].
In Tables
1
–
5, for termolecular processes the relative collision efficiencies for specific third bodies, when available, are given in the line below the process.
Lifetime of the line emission from the LIBS plume; uncertainties are 1σ values.
Lifetime of the concentration of the upper state computed in the kinetic model (initial conditions the same as for Fig.
7).
Table 8
Effect of Environmental Gas on the Production of Pb Excited Atomic States
Initial mixture, air + 9% H2O + the stated Pb mole fraction; initial temperature, 15,000 K.
Temperature 1/e decay time, 25 µs.
Temperature 1/e decay time, 5 µs.
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