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NIST Chemistry WebBook - SRD 69
The NIST Chemistry WebBook provides users with easy access to chemical and physical property data for chemical species through the internet. The data provided in the site are... -
NIST Atomic Energy Levels and Spectra Bibliographic Database
References contained in this database are from Bibliography on Atomic Energy Levels and Spectra, NBS Special Publication 363 and Supplements, as well as current references since... -
NIST Ground Levels and Ionization Energies for the Neutral Atoms - SRD 111
Data for ground state electron configurations and ionization energies for the neutral atoms (Z = 1-104) including references. Version 2.0.