865814.fig.004a
(a)
865814.fig.004b
(b)
Figure 4: (a) Absorption spectra of Fe-MG SiO2 glasses (F1M4, F2M4, F3M4, and F4M4) and M4 glass. (b) Variation of absorbance with molar concentration of Fe-I in F M4 glasses ( ).