Energies of 1snl (l = 3) configurations in He4 I as calculated from polarization theory

journal article
Published by National Institute of Standards and Technology (NIST) in Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry

Vol. 74A (5) , 699-702
https://doi.org/10.6028/jres.074a.058

Abstract

The calculated singlet-triplet mean energies are given for all He⁴ i configurations having 3 ≤ l ≤ n — 1 from 4f to 8k. Since only Stark-shifted transitions have been observed for such configurations with l ≥ 4, the calculated positions are the most accurate available. The polarization energy (to the quadrupole approximation) for two-electron ions may be evaluated for higher nl or Z from the simple formulas. The calculated and observed positions of the Isnf configurations in He⁴ I and Li⁷ II agree within the experimental uncertainties.

Keywords

ATOMIC ENERGY LEVELS
ATOMIC THEORY
HELIUM
POLARIZABILITY