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

Photoabsorption spectra of (NN)-N-14-N-15 were recorded at high resolution with a vacuum-ultraviolet Fourier-transform spectrometer fed by synchrotron radiation in the range of 81-100 nm. The combination of high column density (3 x 10(17) cm(-2)) and low temperature (98 K) allowed for the recording of weak spin-forbidden absorption bands' exciting levels of triplet character. The triplet states borrow intensity from (1)pi(u) states of Rydberg and valence character while causing their predissociation. New predissociation 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 be well-predicted by a coupled-Schrodinger equation model with empirical parameters based on experimental data on N-14(2) and N-15(2) triplet levels. Published under license by AIP Publishing.