Abstract
The hyperfine structure (hfs) of in its metastable and atomic states has been measured by the atomic-beam magnetic-resonance method. The zero-field hfs intervals in the state are The zero-field hfs intervals in the state are In order to obtain the dipole and quadrupole coupling constants from the hfs separations, second- and third-order corrections arising from off-diagonal matrix elements of the hyperfine interaction between the fine-structure levels must be included. The values of the hfs interaction constants before and after secondand third-order corrections are: The individual-electron interaction constants, calculated from the corrected values of and , are The reason for the larger error limits in the corrected, compared with the uncorrected, numbers is discussed and the experimental values of and are compared with theory. Measurements of the magnetic field dependence of the hfs lead to the following estimate for the fine-structure separations: From the ratio the quadrupole moment, without Sternheimer polarization corrections, is b. Expressions for the third-order corrections to the zero-field hyperfine energies are given, and estimates of the intermediate coupling coefficients and are discussed.
- Received 17 August 1966
DOI:https://doi.org/10.1103/PhysRev.153.164
©1967 American Physical Society