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Abstract. We present new laboratory data on the multiplets 2s z IS --2s2p aP, 2s22p 21, _ 2s2p2 4p, and 2s22p 2 zP --2s2p z "5S in nitrogen, oxygen and fluorine, and discuss the Z-dependence of their wave-numbers. These multiplets are very faint in laboratory light sources, but can become prominent in astrophysical sources of low density. Our results confirm the solar identifications of the nitrogen and oxygen multiplets made by Burton et al. Predicted positions of the corresponding multiplets in neon are given.