LIBS Analysis of Geomaterials: Comparative Study of Basalt Plasma Induced by TEA CO₂ and Nd:YAG Laser in Air at Atmospheric Pressure

Table 4

Comparison of signal-to-noise (SNR) ratio for the elements under study, obtained for TEA CO₂ and Nd:YAG laser induced plasma over basalt sample in air at atmospheric pressure.

Element/line (nm)		SNR
		TEA CO2; (160 mJ)	Nd:YAG; (50 mJ)	Nd:YAG; (80 mJ)
Si I 288.16	24.8%	814	526	454
Fe I 358.12	4.0%	918	342	160
Ca II 393.37	3.4%	3860	913	798
Al I 396.15	6.5%	587	456	611
Mg I 285.21	2.9%	536	368	433
Ti II 334.94	0.66%	236	437	127
Mn I 403.08	774 ppm	199	63	59
Sr II 407.77	740 ppm	165	200	61
Cr I 359.35	300 ppm	293	41	97
Cu I 324.75	70 ppm	218	109	53

composition of basalt sample obtained by ICP-OES analysis.