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The applicability of nanosecond infrared (IR) transversely excited   atmospheric (TEA) CO2 laser, operating at 10.6 μm and 100 ns pulse length   (initial spike), induced plasma under reduced air pressure for   spectrochemical analysis of bronze and brass samples was investigated. The   plasma consisted of two clearly distinguished and spatially separated regions   and expanded to a distance of about 10 mm from the surface. Elemental   composition of the samples was determined using a time-integrated   space-resolved laser-induced plasma spectroscopy (TISR-LIPS) technique. Sharp   and well resolved spectral lines mostly atomic, and negligibly low background   emission, were obtained from a plasma region 7 mm from the target surface.   Good signal to background and signal to noise ratios were obtained. Estimated   detection limits for trace elements Mg, Fe, Al and Ca were in the order of 10   ppm in bronze and around 50 ppm in brass. Damage on the investigated samples   induced by TEA CO2 laser radiation was negligible. [Projekat Ministarstva   nauke Republike Srbije, br. 172019

Analytical capability of the plasma induced by IR TEA CO2 laser pulses on copper based alloys