Abstract
A new laser induced plasma temperature measuring method with two lines emitted
from different elements with the same ionization degree is proposed, assuming local
thermodynamic equilibrium condition of the plasma. The influence of measurement
error on deduced temperature accuracy was simulated in theory. A solution containing
Cu, K, and Cr elements was used as the sample. Plasma was generated at the surface
of the solution, and time-resolved spectra were recorded. Two atomic lines, Cu I 324
nm and K I 766 nm, were used to determine the plasma temperature with the proposed
method. Four atomic lines and two ionic lines of Cr were selected to deduce plasma
temperature with the Saha-Boltzmann plot method for comparison. The temperatures
deduced from the two different methods showed similar behavior as a function of
time. The results suggested that this method can be useful in cases where only very
few lines from a single element are available in the spectrum and Boltzmann or
Saha-Boltzmann plots cannot be built.
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