At the National Institute of Standards and Technology we are carrying out a systematic program of critical compilation of wavelengths and energy levels of atoms and atomic ions. For the most part the data are experimental values derived from laboratory observations. In some cases, such as for H-like and He-like ions, the data are derived from calculations with sophisticated atomic structure codes that include relativistic and quantum electrodynamic effects.
Recently completed compilations include:
1. E. B. Saloman, “Energy Levels and Observed Spectral Lines of Xenon, Xe I through Xe LIV,” J. Phys. Chem. Ref. Data, in press (2004).
2. E. B. Saloman and C. J. Sansonetti, “Wavelengths, Energy Level Classifications, and Energy Levels for the Spectrum of Neutral Neon,” J. Phys. Chem. Ref. Data, in press (2004).
3. A. E. Kramida, “Critical Compilation of the Wavelengths and Energy Levels of Singly Ionized Beryllium (Be II),” submitted to Physica Scripta.
4. A. E. Kramida, “Critical Compilation of Wavelengths, Energy Levels, and Transition Probabilities for W I and W II,” submitted to J. Phys. Chem. Ref. Data.
5. J. J. Curry, “A Critical Compilation of Wavelengths, Energy Levels, and Transition Probabilities for Ba I and II,” J. Phys. Chem. Ref. Data, in press (2004).
6. W. Whaling et al., “Argon I Lines Produced in a Hollow Cathode Source, 332 nm to 5865 nm,” J. Res. Natl. Inst. Stand. and Technol., 107, 149 (2002).
Nearing completion are compilations for Ne II (A. E. Kramida and G. Nave), Ne III (A. E. Kramida and G. Nave), and Kr (E. B. Saloman), Rb (J. E. Sansonetti), Cs (J. E. Sansonetti), Ga (T. Shirai, J. Reader, J. Sugar, and A. E. Kramida), and W (T. Shirai and A. E. Kramida) in all stages of ionization.
Further compilations are underway for Ne VII (A. E. Kramida), Ne VIII (A. E. Kramida), and Ar (C. Sansonetti and T. Shirai), Sr (G. Nave) and Ba (J. Curry ) in all stages of ionization.