Preparation of fs-laser–induced degradation of red HgS
This protocol is extracted from research article:
Visualization of vermilion degradation using pump-probe microscopy
Sci Adv, Jun 21, 2019; DOI: 10.1126/sciadv.aaw3136

Pump-probe imaging studies. Red HgS powder was placed between a glass slide and a coverslip and then placed in the pump-probe microscope, as shown in Fig. 2 (A to C). The imaging conditions were: pump-probe, 720 and 817 nm; 256 × 256 pixels; dwell time, 20 μs; and number of τ points, 56 (from −8 to 52 ps). Figure 2A was acquired at 0.45/0.45 mW, then one set of pump-probe images was acquired at 0.45/0.9 mW. After slight phase conversion was observed, the pump-probe power was readjusted to the original power levels (0.45/0.45 mW) to monitor the surface changes (Fig. 2B). Then, two sets of pump-probe images were acquired at 0.9/0.45 and 0.9/0.9 mW to induce more severe degradation. Figure 2C was subsequently acquired at 0.45/0.45 mW.

XRD and SEM-EDS analysis. Red HgS powder was placed between a glass slide and a coverslip; the edges were sealed with plastic tape. The glass slide was placed in the pump-probe microscope, and the surface of red HgS was scanned at a very high power to induce damage: pump-probe, 720 and 817 nm, 2.3/5 mW, τ = 0 fs; image FOV, 350 μm by 350 μm; 128 × 128 pixels; and pixel dwell time, 20 μs. Once the conversion (negative pump-probe signal) was observed, the sample was translated in the x or y direction by one FOV (350 μm). See a picture of the sample in fig. S3A.

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