Phys. Rev. Lett. 87, 193003 (2001) [4 pages]Ionization Potential of the Helium AtomReceived 5 July 2001; revised 17 September 2001; published 23 October 2001 The ground-state ionization potential of the He4 atom is found to be 5 945 204 223 (42) MHz. Along with lower-order contributions, this result includes all effects of relative order α4, α3me/mα, and α5ln2α. Effective operators derived in dimensionally regularized nonrelativistic quantum electrodynamics are employed. The average values of these operators are evaluated using a high-accuracy variational wave function constructed in an exponential basis. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.193003
DOI:
10.1103/PhysRevLett.87.193003
PACS:
31.30.Jv, 12.20.Ds, 32.10.Fn
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