Fig. 3: A visual depiction of fbw,l.
From: Phonon-mediated temperature dependence of Er3+ optical transitions in Er2O3
A schematic showing the difference between the incident photon energy \((h\nu )\) and energy \(({\epsilon }_{{ij}})\) required for the \({{{{{\rm{i}}}}}}\to {{{{{\rm{j}}}}}}\) transition \(({\Delta }_{{ij}})\) relative to the finite bandwidth of a phonon centered at \({\epsilon }_{l}\) and how it relates to the bandwidth factor \({f}_{{{{{{\rm{bw}}}}}},l}\).
