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

Table 3

Electron number density calculated from Stark width of Al I 396.15 nm line.

LIBS system	, nm	, 10^16 cm^−3
TEA CO2 laser (160 mJ)	0.033	4.3
Nd:YAG laser (50 mJ)	0.035	4.6
Nd:YAG laser (80 mJ)	0.040	5.3