Figure 5
From: Rare-earth metal catalysts for high-pressure synthesis of rare diamonds
Representative PL spectra of diamonds produced using light rare-earth metal catalysts. The spectra were recorded at 80 K with excitation of 395 nm for diamonds synthesized in (i) La–C, (ii) Ce–C and (iii) Pr–C systems at 2000 °C. The spectra were normalized to show the same intensity of the diamond Raman peak and displaced vertically for clarity. The near-infrared parts of the spectra were multiplied by factors of (a) 0.06, (b) 0.05 and (c) 0.1.
