cccbdb.nist.gov
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CCCBDB (Computational Chemistry Comparison and Benchmark Database) from NIST is a searchable database of computed gas-phase thermochemistry data for molecules and radicals linked to quantum-chemistry methods. It provides calculated energies, enthalpies of formation, vibrational frequencies and zero-point energies, heat capacities, and benchmark data across various levels of theory and basis sets, with downloadable datasets.
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