Electric-dipole-moment enhancement factor for the thallium atom, and a new upper limit on the electric dipole moment of the electron
Feb, 19753 pages
Published in:
- Phys.Rev.A 11 (1975) 473-476
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Abstract: (APS)
Some time ago, an accurate upper limit on a possible permanent electric dipole moment of the thallium atom in the 6 P122 ground state was obtained by Gould. The result was DTl=[(1.3±2.4)×10−21 cm]e. In connection with this value, we have carried out a calculation of the electric dipole enhancement factor RTl, which is defined as the ratio DTlDe, where De is the corresponding upper limit on a possible electric dipole moment of the (valence) electron. A value RTl=700 was obtained, which leads to an upper limit De=[(1.9±3.4)×10−24 cm]e. This result is comparable with the value De<(3×10−24 cm)e previously obtained by Weisskopf et al. from measurements on the cesium atom, and with the result of Player and Sandars of [(0.7±2.2)×10−24 cm]e obtained from the search for an electric dipole moment in the P23 metastable state of xenon. All three results set a stringent upper limit on the amount of a possible violation of T and P invariance in electromagnetic interactions.References(22)
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