Equilibrium and non-equilibrium clumped isotope signatures in microbially-produced H2

The following data support the study: Equilibrium and non-equilibrium clumped isotope signatures in microbially-produced H2 (2026; Geochimica et Cosmochimica Acta; https://doi.org/10.1016/j.gca.2026.02.028). A detailed description of the data, including methodology and interpretation, is available within the article.
Table 1. Summary of pure culture experimental conditions and isotopic composition. Includes all data within Table 1 in the main text, which provides the basis for Fig. 1C-F, Fig. 2B, Fig. 3D, Fig. S4A, and Fig. S5.Dataset S1. The isotopic composition of microbially produced H2 (this study) compared to the isotopic signatures of other H2 sources and sinks (previous studies). Data for Fig. 4.Dataset S2. Laboratory long-term standard analysis and H2 purification method verification. Data for Figs. S1-S2 (supplementary materials).Dataset S3: The DαH2O-H2 and ΔDDsto. measured in cultures with non-enriched H2O media. Data for Fig. S3.