Date: 12 June, 2023 Dataset Title: Data from "Watching Excited State Dynamics with Optical and X-ray Probes: The Excited State Dynamics of Aquocobalamin and Hydroxocobalamin" Dataset Creators: Roseanne J. Sension, Taylor P. McClain, Ryan M. Lamb, Roberto Alonso-Mori, Frederico Alves Lima, Fernando Ardana-Lamas, Mykola Biednov, Matthieu Chollet, Taewon Chung, Aniruddha Deb, Paul A. Dewan, Jr., Leland B. Gee, Joel Huang Ze En, Yifeng Jiang, Dmitry Khakhulin, Jianhao Li, Lindsay B. Michocki, Nicholas A. Miller, Florian Otte, Yohei Uemura, Tim B. van Driel, and James E. Penner-Hahn Dataset Contact: James Penner-Hahn, jeph@umich.edu Funding: NSF-CHE 1836435, NSF-CHE 2154157), NSF-PHY 919 1757574, DOE Contract Nos. DE-AC02-76SF00515 and DE-AC02-76SF00515. Methodology: The referenced manuscript describes the excited state dynamics of aquo and hydroxocobalamin. This dataset includes all of the data that are referenced in the manuscript. These data were measured at the University of Michigan, at the LCLS, and at the EuXFEL. Detailed methods for the collection and analysis of these data are described in the associated manuscript. UV-visible, X-ray absorption, and X-ray emission data used to characterize the dynamics of aquo and hydroxo cobalamin. Details of data collection and reduction are provided in the associated manuscript. Data files are all text files which contain tab-delimited columns of data corresponding to each figure in the manuscript. Related publication(s): Sension, R.J., et al. (2023). Watching Excited State Dynamics with Optical and X?ray Probes: The Excited State Dynamics of Aquocobalamin and Hydroxocobalamin. J. Am. Chem. Soc. 2023, 145, 25, 14070–14086 Use and Access: This data set is made available under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). To Cite Data: