Energy Levels of Singly Ionized Calcium (Ca II) by National Institute of Standards and Technology
= Energy Levels of Singly Ionized Calcium (Ca II) by National Institute of Standards and Technology
{tag=Work by National Institute of Standards and Technology}
https://physics.nist.gov/PhysRefData/Handbook/Tables/calciumtable6.htm
A tabulation of Ca II configurations, terms, J values and level energies, including the common Ca III ionization limit. It independently verifies the level assignments used for the optical and infrared series.