Abstract
We have calculated the lowest-order relativistic effects for the three lowest states of the helium atom with symmetry {sup 1}S, {sup 1}P, {sup 1}D, {sup 3}S, {sup 3}P, and {sup 3}D using variational Monte Carlo methods and compact, explicitly correlated trial wave functions. Our values are in good agreement with the best results in the literature.
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