Fig. 2.

The ¹⁵N enrichment profile. Wavelength-dependent N-isotopic compositions with respect to (wrt) air composition in N₂ dissociation products by VUV photons in five different sets of experiments (mT refers to millitorr). The errors associated with the measurements are shown in Table 1 (typically are about three times of the size of the symbols). (Inset) The rovibrational spectra of ¹⁴N₂ and ¹⁴N¹⁵N with strong electronic state mixing around 90 nm, where massive N-isotopic fractionation was measured.