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All NIST Scientific and Technical Databases NIST Free Online Databases List Descriptions Databases for Purchase PC Products Online Subscription Databases New Phase Equilibria Diagrams - Order Now! Feedback/Comments Version History Privacy Policy/Security Notice/Accessibility Statement NIST Disclaimer Copyright for NIST Standard Reference Data is governed by the Standard Reference Data Act	Ground Levels and Ionization Energies for the Neutral Atoms Select a Keyword atomic physics atomic spectroscopy electron energy ground state jj coupling physics Last modified: November 6, 2008 (Created: November 9, 2001) For questions or comments: Contact Us