Figure 9: OES spectra taken from PLD plumes of pure ZrO2 and of ZrO2 with 20% MnO2 in 0.1 mbar O2. Only one additional peak from Mn I was found at 476.61 nm. In contradiction, Mn-doped ZnO shows 10 peaks from Mn. Zirconium and hafnium show together 1497 lines in the OES data base. A strong fluorescence background is visible here.