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Photoabsorption spectra of ${}^{14}{\rm N}{}^{15}{\rm N}$ were recorded athigh resolution with a vacuum-ultraviolet Fourier-Transform spectrometer fed bysynchrotron radiation in the range 81 to 100 nm. The combination of high columndensity ($3\times 10^{17}$ cm$^{-2}$) and low temperature (98 K) allowed forthe recording of weak spin-forbidden absorption bands exciting levels oftriplet character. The triplet states borrow intensity from ${}^1\Pi_u$ statesof Rydberg and valence character while causing their predissociation. Newpredissociation linewidths and molecular constants are obtained for the states$C\,{}^3\Pi_u(v=7,8,14,15,16,21)$, $G\,{}^3\Pi_u(v=0,1,4)$, and$F\,{}^3\Pi_u(v=0)$. The positions and widths of these levels are shown to bewell-predicted by a coupled-Schroedinger equation model with empiricalparameters based on experimental data on ${}^{14}{\rm N}_2$ and ${}^{15}{\rmN}_2$ triplet levels.

The spin-forbidden vacuum-ultraviolet absorption spectrum of 14N15N