Direct Powder Analysis by Laser-Induced Breakdown Spectroscopy Utilizing Laser-controlled Dust Production in a Small Chamber

다국어 초록 (Multilingual Abstract)

The direct analysis of powder samples has been carried out successfully by utilizing lasercontrolled dust production in a small chamber pressurized to one atmosphere with He. A 355-nm Nd:YAG laser (5 mJ, 10 Hz) was focused on the surface of the powder sample to form a microplasma, which released a tiny amount of powder in the form of a dust. A 1064-nm Nd:YAG laser operating at higher energy (110 mJ, 10 Hz), which is not synchronized with the 355-nm Nd:YAG laser, was then used to form a He gas breakdown plasma in the dust region to atomize and excite the dust. We assumed that this excitation process involved metastable He atoms produced in the breakdown plasma. The emission spectra obtained for a variety of powder samples by using this method were found to be of good quality. Furthermore, the method can be used to analyze liquid samples by placing a drop of liquid onto a small piece of cotton to avoid splashing. Indeed, the rapid and semi-quantitative analysis of both powder and liquid samples has proved to be possible using the present technique. One advantage of this technique is that analyses can be conducted even when the samples are available in only very small amounts.

참고문헌 (Reference)

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