Chinese Journal of Lasers, Vol. 47, Issue 6, 0611002 (2020)
Temporal Profiles of Atomic Emissions in High-Repetition-Rate Laser-Ablation Spark-Induced Breakdown Spectroscopy
Cao Yu, Kang Juan, Chen Yuqi, and Li Runhua*
- School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 510641, China
For understanding the temporal profiles of the atomic emissions in high-repetition-rate laser-ablation spark-induced breakdown spectroscopy (HRR LA-SIBS), a 925 silver alloy sample was experimentally analyzed by HRR LA-SIBS. With different capacitances in the discharge circuit, the temporal profiles of atomic emissions of Ag I 328.07 nm, Ag I 338.29 nm, Ag I 520.91 nm, Ag I 546.55 nm, Cu I 324.75 nm, and Cu I 510.55 nm were experimentally studied. Under the excitation of the spark discharge, these six transitions exhibited close temporal profiles, even with different corresponding upper energy levels. The electric characteristics of the spark discharge were key factors that determine the persistence times and attenuation characteristics. Moreover, the influence of the upper energy level on them was negligible. In HRR LA-SIBS, the spectra recorded in non-gated signal recording mode were approximately equivalent to those recorded in gated signal recording mode for quantitative elemental analysis, which is helpful for simplifying the requirement of this technique for gated photon detectors.
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