FIG. 8.

Sample 8 (514.5 nm excitation). The sample was fluorescent at 785 nm, and slope of fluorescence is present also when 514.5 nm excitation was used, but with observable Raman features. (A) Matrix with calcite and dolomite peaks 1086 and 1098 cm⁻¹, respectively (calcite is prevailing through the sample); very broad features of disordered carbon are present as well between 1300 and 1650 cm⁻¹. (B) Broad Raman features of disordered carbon.