Session KP01 - Poster Session III.
POSTER session, Tuesday afternoon, March 23
Exhibit Hall, GWCC
The Lamb shift continues to provide one of the most important tests of quantum electrodynamics. A previous measurement in He^+ by the anisotropy method yielded a value that is 70(12) parts per million higher than theory when two-loop binding corrections are included( K. Pachucki et al.), J. Phys. B 29, 117 (1996).. However, a recent test of the method in hydrogen gave results in agreement with theory and other measurements at the \pm15 MHz (15 ppm) level of accuracy( A. van Wijngaarden, F. Holuj, and G. W. F. Drake, Can.\ J. Phys.\ 76), 95 (1998).. The previous He^+ measurement is now being repeated with improved accuracy, and final results will be reported at the conference.