Atom probe mass spectrum. APT mass spectrum obtained on Er-doped Si-rich SiO2 sample. (a) Typical mass spectrum with Si, O, and Er identified peaks. Isotopes of silicon for the Si2+ peak are evidenced in the inset. (b) Magnification of the Er peaks in the 52- to 96-M/n region.
Talbot et al. Nanoscale Research Letters 2013 8:39 doi:10.1186/1556-276X-8-39