Vertical excitation energies and oscillator strengths for pyrene at the S0, S1, and S2 state minima are shown in Table . They were calculated with ADC(2) using the SV(P) basis set. At the ground-state (S0) minimum geometry, the bright states are S2, S4, and S9. The S1 state at its minimum geometry is dark with a near-zero oscillator strength. The S2 state, at its minimum, has a strong oscillator strength of 0.544. The the vertical excitation and the band maximum reported in Table . Nevertheless, the middle-and highenergy bands are blue-shifted by about 0.20 and 0.25 eV, respectively.