Title: NIST Releases Database of Hydrogen and Deuterium Energy Levels
The National Institute of Standards and Technology (NIST) has released a comprehensive database of theoretical energy levels for hydrogen and deuterium atoms. The database covers principle quantum numbers from n=1 to n=200 and includes all allowed orbital angular momentum and total angular momentum values (j).
The calculations are based on the most current understanding of various theoretical effects, including relativistic, quantum electrodynamic, recoil, and nuclear size effects. However, hyperfine structure effects are not included in the database.
The database uses fundamental constants from the CODATA 2002 least-squares adjustment, with minimal changes expected from using more recent values. Quoted uncertainties account for theoretical calculation uncertainties, fundamental constant uncertainties, and covariances between various contributions and input parameters.
Users can interactively request individual energy levels and transition frequencies, with calculations performed on demand due to the large volume of possible data.
Source: https://www.nist.gov/pml/energy-levels-hydrogen-and-deuterium
Keywords: hydrogen, deuterium, angular momentum, fundamental constants, theoretical predictions
