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Behavior Of Grain Boundary Resistivity In Metals Predicted By A Two-Dimensional Model, Rand Dannenberg, Alexander H. King
Behavior Of Grain Boundary Resistivity In Metals Predicted By A Two-Dimensional Model, Rand Dannenberg, Alexander H. King
Alexander H. King
The behavior of a model for the specific grain boundary resistivity in metallic bamboo conductor lines is developed and compared to other theoretical treatments, and to experiment. The grain boundary is modeled as an array of scatterers on a plane. The scatterers are called “vacancy-ion” complexes, in which the vacancy represents the boundary free volume, and the ion is an atom adjacent to the vacancy. Three cases are investigated, that of noninterfering scatterers, a continuum of interfering scatterers, and discrete interfering scatterers. The approximations used lead to a specific grain boundary resistivity ∼10−16 Ω m2 for aluminum, in agreement with …
Structural Change Of The Mn Cluster During The S2→S3 State Transition Of The Oxygen-Evolving Complex Of Photosystem Ii. Does It Reflect The Onset Of Water/Substrate Oxidation? Determination By Mn X-Ray Absorption Spectroscopy, Wenchuan Liang, Theo A. Toelofs, Roehl M. Cinco, Annette Rompel, Matthew J. Latimer, Edward Yu, Kenneth Sauer, Melvin P. Klein, Vittal K. Yachandra
Structural Change Of The Mn Cluster During The S2→S3 State Transition Of The Oxygen-Evolving Complex Of Photosystem Ii. Does It Reflect The Onset Of Water/Substrate Oxidation? Determination By Mn X-Ray Absorption Spectroscopy, Wenchuan Liang, Theo A. Toelofs, Roehl M. Cinco, Annette Rompel, Matthew J. Latimer, Edward Yu, Kenneth Sauer, Melvin P. Klein, Vittal K. Yachandra
Edward Yu
The oxygen-evolving complex of Photosystem II in plants and cyanobacteria catalyzes the oxidation of two water molecules to one molecule of dioxygen. A tetranuclear Mn complex is believed to cycle through five intermediate states (S0−S4) to couple the four-electron oxidation of water with the one-electron photochemistry occurring at the Photosystem II reaction center. We have used X-ray absorption spectroscopy to study the local structure of the Mn complex and have proposed a model for it, based on studies of the Mn K-edges and the extended X-ray absorption fine structure of the S1 and S2 states. The proposed model consists of …