Abstract
The use of laser microspectral analysis for the quantitative measurement of silicon and chromium, present in concentrations as low as 0.08% in mild steels, is investigated. A comparison is made between the use of Q-switched and normal ruby laser operation, both spark assisted. Time integrated electron temperature measurements of iron plasmas and time resolved spectra of A1 plasmas are presented and used to determine if the ‘local thermodynamic equilibrium’ model applies to these laser initiated plasmas.
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