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A beam of unpolarized metastable He('+) 2s(, 1/2) ions, quenched by a static electric field, (')E has an anisotropy in the emitted radiation that can be used to determine the He('+) 2('2)s(, 1/2)-2('2)p(, 1/2) Lamb shift. A high precision measurement of this anisotropy for a field strength of (VBAR)(')E(VBAR) = (370.97 (+OR-) 0.06) V/cm has been made. The value of the field-free anisotropy, A('(0)), adjusted by small corrections is (0.1178082 (+OR-) 0.0000086), where the uncertainty is the statistical one standard deviation. Using much improved apparatus over Drake, Goldman and van Wijngaarden, our values for both the anisotropy A('(0)) and the Lamb shift, S = (14022.67 (+OR-) 1.06) MHz lie lower by 17 standard deviations from theirs. The great discrepancy is not understood, and may be attributed to the inherent difficulties of measuring light intensities by photon counting techniques. Source: Dissertation Abstracts International, Volume: 47-09, Section: B, page: 3817. Thesis (Ph.D.)--University of Windsor (Canada), 1986.
PATEL, JAGDISH S., "A MEASUREMENT OF THE SINGLE POSITIVE HELIUM ION(DOUBLET-2S(1/2)-DOUBLET-2P(1/2)) LAMB SHIFT." (1986). Electronic Theses and Dissertations. 654.