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Laser atomic emission spectroscopy, based on the efficient evaporation of a small sample amount (10⁻¹⁰–10⁻¹¹ g), atomization, and simultaneous excitation of emission spectra of all components, is a highly popular method for rapid analysis of multicomponent alloys. It enables analysis without prior chemical or mechanical surface preparation. In most studies on this topic, the process of selecting spectral lines of elements for calculations is overlooked, with preference given to the most intense lines in the studied spectral range. However, a common scenario is that the main component (with a concentration ranging from 60–99 %) may only have resonance lines
in the considered region, which are prone to self-absorption. This manifests as line contour distortion and the appearance of a "dip" at the central wavelength. Reducing the recorded intensity of resonance lines by adjusting laser radiation parameters often leads to a drop in the intensity of spectral lines from impurities (with concentrations below 1 %) to the background level. The study focused on a "maximally complex object" ‒ a thin coating of low-melting gallium on a refractory tungsten substrate. The qualitative analysis technique, enabling simultaneous detection of gallium's resonance lines and the "weak lines" of the tungsten substrate, involved laser ablation of the sample surface with double laser pulses (varying the interpulse interval allows control over additional excitation processes in the primary plasma) and power density adjustment through laser beam defocusing relative to the surface.
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Shcherba, U. K. Laser Power Density Control for Elementary Analysis of Coatings and Thin Metal Layers / U. K. Shcherba, K. F. Ermalitskaya // Materials and Technologies. – 2025. – № 2 (16). – P. 16–25. – DOI 10.24412/2617-149X-10.24412/2617-149X-2025-2-16-25.
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11.12.2025