With NEA, vibronic effects pull the lifetime down to a few ms in both molecules. The NEA result contains both vertical and vibronic contributions. Therefore, the ratio between the NEA and the vertical phosphorescence lifetimes shown in Table allows for estimating the relative vertical contributions to the spectrum. For BA, the vertical contributions are responsible for 65% of the spectrum. This contribution is smaller than that estimated by Olmsted and El-Sayed , who gave 93%. For MeBA at the global minimum, the vertical contribution of 49% is still significant. For MoBA (global minimum) and DMABA, however, it drops to 1 and 4%, respectively, rendering the vertical estimate meaningless.