Issue 10, 2023

Fraunhofer-type absorption lines from a submerged Cu target by long-pulse laser-induced breakdown spectroscopy: toward non-gated detection

Abstract

The underwater Fraunhofer-type absorption signal from a plasma generated on an immersed Cu target was investigated using single-pulse laser-induced breakdown spectroscopy (LIBS). We found that clear underwater Fraunhofer-type absorption lines were observed with a long-pulse irradiation, while the signal observed with a short-pulse irradiation was quite indistinct. The time-resolved spectra show that both absorbance and line broadening gradually decrease with increasing delay time, i.e., Fraunhofer-type absorption occurs at the initial stage of the plasma. This enables us to obtain clear Fraunhofer-type absorption lines by a non-gated detection method, which can effectively simplify the LIBS equipment. The results not only provide some insights into the generation and evolution of underwater Fraunhofer-type absorption, but more importantly, suggest a new idea for underwater LIBS analysis, with a non-gated detection scheme.

Graphical abstract: Fraunhofer-type absorption lines from a submerged Cu target by long-pulse laser-induced breakdown spectroscopy: toward non-gated detection

Article information

Article type
Communication
Submitted
25 Apr 2023
Accepted
20 Jun 2023
First published
16 Aug 2023

J. Anal. At. Spectrom., 2023,38, 1908-1913

Fraunhofer-type absorption lines from a submerged Cu target by long-pulse laser-induced breakdown spectroscopy: toward non-gated detection

N. Li, N. Nishi, R. Zheng, Y. Zheng, J. Guan, C. Xue, Z. Zhang and T. Sakka, J. Anal. At. Spectrom., 2023, 38, 1908 DOI: 10.1039/D3JA00129F

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