Fig. 5
From: Studying an antiaromatic polycyclic hydrocarbon adsorbed on different surfaces

Spin-polarised DFT calculations. a Energy-level diagram obtained from DFT calculations carried out with the G0W0 approximation. Marked energy levels correspond to the lowest-laying unoccupied states. b Constant-current STM image of IF taken with a metal tip at the energy corresponding to the negative ion resonance (NIR) (V = 1.0 V and I = 1.0 pA). c, d Simulated STM images of orbitals α (c) and β (d). Scale bar, 500 pm