The emission spectrum of PtO has been studied between 3800 Å and 8900 Å. In addition to the earlier reported A-X and D-X transitions several new transitions have been analysed. Most of them have either the X state or another state called the x state as their lower state. The X state has the character of a 0+ state, the x state has the character of a 1 state in Hund's coupling case c which together correspond to a 3Σ- state. The X state together with the x state seem to constitute the ground state of PtO.The following molecular constants in cm-1 were obtained:

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The optical spectrum of NiD has been reinvestigated. In the yellow-red wavelength region three sub-systems, A2Δ5/2-X2Δ5/2. 2Φ7/2-X2Δ5/2, and 2Δ3/2-X2Δ3/2, have been found. Four bands of these sub-systems were rotationally analysed. The analysis was also extended to the (3, 0) band of the earlier known B2Δ5/2-X2Δ5/2 sub-system. In addition, the (0, 0) band of the 2Δ3/2-X2Δ5/2 transition was analysed.The results for NiD have been compared with those earlier obtained for NiH. Two term value calculations have been made, one for NiH and one for NiD. Since intercombination bands are known, all the term values could be calculated relative to each other. The term values are presented in a diagram.

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