Figure 7
From: Rare-earth metal catalysts for high-pressure synthesis of rare diamonds
PL spectra of diamonds synthesized from the Ce catalyst with Ge and Sn additives. (a) Overview PL spectra of diamonds from (i) Ce–Ge–C and (ii) Ce–Sn–C systems. The spectra were recorded at 80 K with excitation of 395 nm and displaced vertically for clarity. (b) PL spectra in the region of zero-phonon lines of (i) GeV− and (ii) SnV− centers. The inset shows schematic structure of electronic transitions at the centers.
