Analytical Sciences

Abstract − Analytical Sciences, 22(10), 1275 (2006).

Stabilization of the Spark-discharge Point on a Sample Surface by Laser Irradiation for Steel Analysis
Hideyuki MATSUTA,* Kuniyuki KITAGAWA,** and Kazuaki WAGATSUMA*
*Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan
**Ecotopia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
A combined technique with laser irradiation is suggested to control spark discharge for analytical use, having a unique feature that firing points of the spark discharge can be fixed by laser irradiation. Because the spark discharge easily initiates at particular surface sites, such as non-metallic inclusions, called selective discharge, the concentration of some elements sometimes deviates from their average one in spark discharge optical emission spectrometry. Therefore, stabilization of firing points on a sample surface could improve the analytical precision.