Fig. 3: Reorganization energy contribution.
From: Tightly bonded excitons in chiral metal clusters for luminescent brilliance

Reorganization energy components as a function of frequency at the PBE0/def2-SVP level in (a) R-Au2Cu2(iptt)4, (b) R-Au2Cu2(mtt)4, (c) R-Au2Cu2(ptt)4, and (d) R-Au4(ptt)4, the top three normal modes that contribute to the reorganization energy for the four metal clusters are labeled in the red box.