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Accurate Fourier-transform spectroscopic absorption measurements of vacuumultraviolet transitions in atomic nitrogen and carbon were performed at theSoleil synchrotron. For $^{14}$N transitions from the $2s^22p^3\,^4$S$_{3/2}$ground state and from the $2s^22p^3\,^2$P and $^2$D metastable states weredetermined in the $95 - 124$ nm range at an accuracy of$0.025\,\mathrm{cm}^{-1}$. Combination of these results with data from previousprecision laser experiments in the vacuum ultraviolet range reveal an overalland consistent offset of -0.04 \wn\ from values reported in the NIST database.%The splitting of the $2s^22p^3\,^4$S$_{3/2}$ -- %$2s2p^4\,^4$P$_{5/2,3/2,1/2}$The splittings of the $2s^22p^3\,^4$S$_{3/2}$ -- $2s2p^4\,^4$P$_{J}$transitions are well-resolved for $^{14}$N and $^{15}$N and isotope shiftsdetermined. While excitation of a $2p$ valence electron yields very smallisotope shifts, excitation of a $2s$ core electron results in large isotopeshifts, in agreement with theoretical predictions. For carbon six transitionsfrom the ground $2s^22p^2\,^3$P$_{J}$ and $2s^22p3s\, ^3$P$_{J}$ excited statesat $165$ nm are measured for both $^{12}$C and $^{13}$C isotopes.

Fourier-transform VUV spectroscopy of $^{14,15}$N and $^{12,13}$C