Time-resolved spectroscopy for 5s′4D7/2 state transitions undergoing electron–ion recombination in femtosecond laser-produced copper plasma<xref rid="cpb_26_12_124208_fn1" ref-type="fn">*</xref> <fn id="cpb_26_12_124208_fn1"> <label>*</label> Project supported by the National Natural Science Foundation of China (Grant No. 51705009) and the NSAF of China (Grant No. U1530153). </fn>

Time-resolved spectroscopy for 5s′⁴D_7/2 state transitions undergoing electron–ion recombination in femtosecond laser-produced copper plasma* *

Project supported by the National Natural Science Foundation of China (Grant No. 51705009) and the NSAF of China (Grant No. U1530153).

Song Hai-Ying¹, Li Hui¹, Zhang Yan-Jie¹, Gu Peng¹, Liu Hai-Yun¹, Li Wei², Liu Xun², Liu Shi-Bing^{1, †}

(color online) Schematic diagram for experimental arrangement, where the components in the dashed frame are used for conversion of laser polarization state, SP is a beam splitter, EM is an energy meter used to detect the applied laser energy, AT is an attenuator for adjusting the pulse energy arrived at the target surface, L_1,2,3 are lenses, and MS is a two-dimensional (2D) motorized platform on which Cu sample is fixed.