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For the first time in visible part of the $D_2$ emission spectrum the pseudodoublets representing partly resolved fine structure of rovibronic lines havebeen observed. They are characterized by splitting values about 0.2 cm$^{-1}$and relative intensity of the doublet components close to 2.0. It is shown thatthey are determined by triplet splitting in lower rovibronic levels of various$^3\Lambda_g^\pm \to c^3\Pi_u^-$ electronic transitions. It is proposed to usean existence of such partly resolved fine structure patterns for identificationof numerous unassigned spectral lines of the $D_2$ molecule coming from greatvariety of triplet "gerade" electronic states to vibro-rotational levels of the$c^3\Pi_u^-$ state.

Observation of the fine structure for rovibronic spectral lines in visible part of emission spectra of $D_2$