Spectroscopic Description of the E 1 State of Mo Nitrogenase Based 2 on Mo and Fe X ‐ ray Absorption and Mo ssbauer Studies

2 on Mo and Fe X‐ray Absorption and Mo ssbauer Studies 3 Casey Van Stappen,† Roman Davydov,‡ Zhi-Yong Yang, Ruixi Fan, Yisong Guo, Eckhard Bill,† 4 Lance C. Seefeldt, Brian M. Hoffman,‡ and Serena DeBeer*,† 5 †Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34−36, 45470 Mülheim an der Ruhr, Germany 6 Department of Chemistry and Biochemistry, Utah State University, Logan, Utah 84322, United States 7 ‡Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States 8 Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States

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