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) Comparison of both linear and circular polarized states of laser pulse for the emitted spectral intensities and occupied lifetimes under different laser power, where the evolutions of spectral intensity are shown in panels (a)–(b) for Λ₁ line emission and panels (d)–(e) for Λ₂ line emission, and the fitted lines for occupation lifetimes on the excited state 5s′⁴D_7/2 are represented in panel (c) for Λ₁ transition and panel (f) for Λ₂ transition.