[9p-E308-1~15] 8.1 Plasma production and diagnostics

3:15 PM - 3:30 PM JST(6:15 AM - 6:30 AM UTC)

[9p-E308-7] Effect of the Relative Position of Arc and Laser-Induced Plasmas on Spatiotemporal Emission Distributions above a Molten Metal Surface

〇Hitoshi Muneoka¹, Honatsu Sorai¹, Takahide Gunji^1,2, Makoto Sugimoto¹, Masaya Shigeta¹ (1.Tohoku Univ., 2.Univ. Tokyo)

Keywords:

LIBS,Arc Plasma,Laser Induced Plasma (LIP)

Arc-plasma-assisted LIBS (AP-LIBS) superimposes the arc plasma intrinsically present in an electric arc furnace onto a laser-induced plasma (LIP) to enhance the emission signal. Using the horizontal arc–laser distance L_A-L as an index, we examined how the relative position of the arc and the LIP affects the spatiotemporal emission distribution on a molten metal surface. Shortly after laser irradiation, the position and growth of the LIP emission near the arc changed in a way that could not be explained by the excitation temperature alone. After the LIP decayed, the arc emission was enhanced by the LIP, most markedly where the two emission regions overlapped. These results show that the signal enhancement in AP-LIBS depends strongly on the relative position of the arc and the LIP.