Of the snapshots used to generate the absorption spectra in Fig. , only 25% satisfy the criterion s OH ≤ 0.97. This minority population cannot be ignored when it comes to the UV spectroscopy, however, as it supports an intense 1b 2 (H 2 O) → 2p( OH) charge-transfer transition. As a result, the 25% population of hemibonded radicals contributes about equally to the absorption spectrum alongside the 75% of spin-localized configurations, as shown in the spectral decomposition presented in Fig. . The disproportionate contribution from hemibonded configurations is a direct result of the 4-5× larger oscillator strengths associated with these geometries, which can be seen clearly in Fig. where the total oscillator strength is partitioned according to s OH . Whereas the decomposition in Fig. is weighted by population, Fig. makes it clear that the overwhelming majority of the integrated oscillator strength comes from hemibonded configurations.