Nonrelativistic energy levels of the helium atom
D. Aznabayev*,
A.K. Bekbaev and
V. Korobov*: corresponding author
Pre-published on:
October 15, 2019
Published on:
February 18, 2020
Abstract
The nonrelativistic ionization energy levels of a helium atom are calculated for S, P, D, and F states. The
calculations are based on the variational method of “exponential” expansion. The convergence of the calculated
energy levels is studied as a function of the number of basis functions N. This allows us to claim that the obtained
energy values (including the values for the states with a nonzero angular momentum) are accurate up to 28–35
significant digits.
DOI: https://doi.org/10.22323/1.353.0060
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