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We establish an experimental method for a detailed investigation of inelasticcollisional properties between ytterbium (Yb) in the metastable${}^3\mathrm{P}_2$ state and ground state lithium (Li). By combining an opticallattice and a direct excitation to the ${}^3\mathrm{P}_2$ state we achieve highselectivity on the collisional partners. Using this method we determineinelastic loss coefficients in collisions between$^{174}$Yb(${}^3\mathrm{P}_2$) with magnetic sublevels of $m_J=0$ and $-2$ andground state $^6$Li to be $(4.4\pm0.3)\times10^{-11}~\mathrm{cm}^3/\mathrm{s}$and $(4.7\pm0.8)\times10^{-11}~\mathrm{cm}^3/\mathrm{s}$, respectively. Absenceof spin changing processes in Yb(${}^3\mathrm{P}_2$)-Li inelastic collisions atlow magnetic fields is confirmed by inelastic loss measurements on the $m_J=0$state. We also demonstrate that our method allows us to look into lossprocesses in few-body systems separately.

Collisional stability of localized Yb(${}^3\mathrm{P}_2$) atoms immersed in a Fermi sea of Li