Created by Igor Bray and Yuri Ralchenko. Modified by Karen Lewis to include magnetic sublevel data for helium and by Nicolas Mori to include positron, proton, and relativistic data.

• The CCC method yields accurate excitation and ionisation cross sections for atomic and ionic targets which are well-modelled by one or two valence electrons above a Hartree-Fock core.
• Inner core ionisation can be a major contributor to the total ionisation cross section. Such contributions can be estimated using various forms of Born-based approximations. Contact me at I.Bray@curtin.edu.au for details.

• Hydrogen I (https://link.aps.org/doi/10.1103/PhysRevA.46.6995)
• Helium I (https://link.aps.org/doi/10.1103/PhysRevA.52.1279)
• Helium II (https://doi.org/10.1088/0953-4075/26/23/006)
• Lithium I (https://link.aps.org/doi/10.1103/PhysRevA.49.1066)
• Beryllium I (https://doi.org/10.1088/0953-4075/30/24/023)
• Sodium I (https://link.aps.org/doi/10.1103/PhysRevA.49.1066)
• Tin I (https://doi.org/10.1016/j.adt.2023.101586)

• Beryllium I (Submitted)
• Boron I (https://doi.org/10.3390/atoms12070036)
• Carbon I (https://doi.org/10.1103/PhysRevA.107.032817)
• Oxygen I (https://doi.org/10.1140/epjd/s10053-023-00762-x)
• Fluorine I (https://doi.org/10.1088/1361-6455/ad7f35)
• Neon I (https://doi.org/10.1140/epjd/s10053-024-00809-7)
• Argon I (https://doi.org/10.1140/epjd/s10053-024-00809-7)
• H-like ions (Li III, Be IV, B V, C VI, N VII, O VIII, F IX) (https://doi.org/10.1088/1361-6455/adba9e)

• Helium I (https://doi.org/10.1103/y3hw-kyc4)