Laser induced breakdown spectroscopy is a μ-destructive technique that determines the elemental composition of a sample by detecting the atomic emission produced when a laser ablates a small portion of material from the surface.
When the laser impacts the sample, a minuscule /tiny amount of material (on the order of 10⁻⁹ to 10⁻¹² grams) is ablated (removed). This instantly generates a high-temperature plasma plume where the ablated material is dissociated into ions and excited atoms. After an initial continuous emission, the distinct atomic emission lines emerge, reflecting the elemental composition of the sample (in accumulative measurement mode). Furthermore, as the laser progressively ablates deeper layers of the sample, it enables the analysis of compositional variations as a function of depth, facilitating micro-stratigraphic analysis (in kinetic measurement mode).
This technique does not require sample preparation and offers rapid interpretation. The calibration in wavelength is carried out using standards of known composition and a certified standard is analysed as a quality control measure.