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. 2020 Oct 8;10:16837. doi: 10.1038/s41598-020-74003-1

Figure 3.

Figure 3

K emission spectra of FeSO4 with a concentration of 1 mol/L (A) and 0.2 mol/L (B) at different beam conditions (A and B TOP) and the difference spectra (with a 5 × zoom) compared to the unmodified spectrum acquired at low intensity (A and B BOTTOM). The 10 fs and 30 fs spectra were collected with a 2 μm size beam and intensities of 9 × 1017 and 5 × 1017 W cm−2 respectively.