Weekly Featured Article

Suppression Of Self-Absorption Effect in Laser-Induced Breakdown Spectroscopy By Employing A Penning-Like Energy Transfer Process in Helium Ambient Gas

Rinda Hedwig (1), Ivan Tanra, Indra Karnadi, Marincan Pardede, Alion Mangasi Marpaung, Zener Sukra Lie, (2) Koo Hendrik Kurniawan, Maria Margaretha Suliyanti, Tjung Jie Lie, and Kiichiro Kagawa

(1) Computer Engineering Department, Faculty of Engineering, Bina Nusantara University, Jakarta 11480, Indonesia

(2) Automotive & Robotics Program, Computer Engineering Department, Binus ASO School of Engineering, Bina Nusantara University, Jakarta 11480, Indonesia

A unique approach for achieving total suppression of the self-absorption effect in laser-induced breakdown spectroscopy (LIBS) has been demonstrated employing a previously published technique of laser-induced plasma spectroscopy utilizing a helium (He) metastable excited state (LIPS-He*).This achievement was attained by the use of the He metastable excited state (He*) and a Penning-like energy transfer mechanism for the delayed excitation of the ablated analyte atoms. KCl and NaCl samples showed the disappearance of the self-absorption emission lines of K I 766.4 nm, K I 769.9 nm, Na I 588.9 nm, and Na I 589.5 nm, and the FWHM values of K I 766.4 and Na I 588.9 nm were found to be 0.8 nm and 0.15 nm, respectively, by LIPS-He* as compared to 4.8 nm and 1.4 nm, respectively, by single-laser operation. A standard Al sample also showed the total disappearance of the self-absorption emission lines Al I 394.4 nm and Al I 396.1 nm. The FWHM of Al I 396.1 nm was 0.12 nm when LIPS-He* was employed compared

to 0.44 nm when a single laser was used. A remarkable linear calibration line with zero intercepts was also obtained for high-concentration Al samples (87.0%, 93.0% and 99.8%). Thus, it is established that the self-absorption effect can be completely neglected when excitation through He* is employed in LIBS.

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