• Select "Matrix elements", "Transition rates", "Polarizabilities", or "Other data" tab and then click on the atom/ion button to display the data. Alternatively, select one of these options from the menu on top of the page and then select an atom/ ion.
  • Click on "Learn more" button or "About the project" for details on available data and computational methods.
  • Use "Feedback" button to send us your comments/ suggestions.
  • Close
    Transition Matrix Elements

    Portal for High-Precision Atomic Data and Computation

    Version 1.0
    Last Update to Data Content: January 2021, Release Date: April 2021, Version History

    This portal provides transition matrix elements, transition rates, radiative lifetimes, branching ratios, and polarizabilities for atoms and ions. The data are calculated using a high-precision state-of-the-art linearized coupled-cluster method. All values include estimated uncertainties. Data for more systems will be added in the future. Experimental values are included with references where high-precision data are available. Future updates will also include releases of user-friendly atomic codes. We seek community input to improve the portal and guide the next stages of the project. Learn more

    Supported by the National Science Foundation