Desorption of physisorbed molecular oxygen from coronene films and graphite surfaces.

We present a study on the adsorption and desorption of molecular oxygen (O) on highly oriented pyrolytic graphite and coronene films deposited on it. To this end, density functional theory calculations were performed and experiments were made using the FORMOLISM device, which combines ultra-high vacuum, cryogenics, atomic or molecular beams, and mass spectrometry techniques. We first studied the desorption kinetics of dioxygen (O) on a coronene film and graphite at 15 K using the thermally programed desorption technique.