Figure 4
From: Magnetic field dependence of singlet oxygen generation by nanoporous silicon
Energy level diagram for the energy transfer from photoexcited silicon nanoparticles to oxygen molecules. Left: the triplet (bottom) and singlet (top) levels of molecular oxygen in a magnetic field, showing the zero-field splitting between the m J = 0 and the m J = ±1 levels; right: the ground state (bottom) and triplet exciton (top) states of a silicon nanoparticle in a magnetic field. In this model, the exchange coupling between the two triplet states results in energy transfer between three possible pairs of states, of which one example is indicated by the vertical and curved arrows.