Figure 8: OES spectra taken from PLD plumes of SrTiO3, BaTiO3, and SrRuO3 in 0.1 mbar O2, in the wavelength range from 435 to 515 nm. For ruthenium only 2 lines could be clearly identified, while for Sr, Ti, and Ba about 20 lines were found from 250 to 1,000 nm wavelength.