The ${}_{}{}^5{}_{}{}^{}$${\mathit{D}}_3$(4${\mathit{f}}^6$)${\mathrm{-}}^7$${\mathit{F}}_0$(4${\mathit{f}}^6$) transition of ${\mathrm{Sm}}^{2+}$ in SrFCl is found to be anomalously strong and it exhibits an asymmetric line shape, which is interpreted in terms of resonant interaction between the ${}_{}{}^5{}_{}{}^{}$${\mathit{D}}_3$ excited state and the vibronic levels of a low-lying 4${\mathit{f}}^5$5d electronic state. The electronic coupling strength is estimated to be of the order of 100 ${\mathrm{cm}}^{\mathrm{-}1}$. The symmetry species of interacting levels are identified, and the possibility of an E×(${\mathit{b}}_1$+${\mathit{b}}_2$) type of Jahn-Teller effect in the 4${\mathit{f}}^5$5d state is discussed.

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