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License and attribution

The root LICENSE.md file is the canonical repository license statement.

Summary:

  • Code in src/, scripts/, and tests/ is released under the MIT License.
  • Released data tables, metadata, documentation, and notebooks are released under Creative Commons Attribution 4.0 International (CC BY 4.0), unless a file or upstream notice states otherwise.
  • Frozen basis files retain the Basis Set Exchange BSD-3-Clause notice included in data/basis_sets/LICENSE-BSE-BSD-3-Clause.txt.
  • Compact atomic-state labels are prepared from the NIST Atomic Spectra Database, NIST Standard Reference Database 78. Raw NIST ASD pages and quantitative SRD tables are not redistributed in this repository.

When publishing work based on these data, cite the atomref-proatoms concept DOI, report the exact release version and dataset ID or basis branch, and cite Basis Set Exchange, the upstream basis references used by the selected dataset, and the NIST Atomic Spectra Database for the state-configuration source layer. The repository root CITATION.cff cites the released dataset and therefore records type: dataset and the dataset license, CC-BY-4.0. The accompanying code remains MIT-licensed under the root LICENSE.md; the Python distribution's metadata reflects both kinds of bundled material. Use the version-specific v2.0.0 DOI when an immutable reference to the exact archived files is required. See the full citation and reuse guidance.