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Pb centers dominate radiation-induced interface defects. On the (100) Si/SiO2 interface, the Pb0 center dominates radiation damage, but another center, the Pb1, plays a secondary role. Neither the electronic density of states nor the capture cross section of this center are well established. This study provides information about both the density of states and capture cross section of Pb1. The study also shows that some refinement is required in techniques utilized to separate interface trap space charge from space charge in the oxide.