Abstract
Paramagnetic resonance absorption at 3-cm wavelengths is observed for tetravalent in a single crystal of Zr at helium temperatures. The observed spectra correspond to the allowed transitions () and the forbidden transitions (, , ) of a system described by the spin Hamiltonian, , with , , Mc/sec, , and . The errors indicate a small deviation from isotropy. It is further observed that , indicating that if is positive, as is strongly indicated by the nuclear shell model, then is negative. An additional electron-nuclear double-resonance experiment is used to determine directly the nuclear magnetic moment nuclear magnetons. This value includes a correction of 9% due to perturbations of an excited state about 1900 above the ground-state doublet of in its octahedral crystal field. A lower frequency double-resonance experiment is used to measure the weak hyperfine interaction of the ion with its neighbors, of order Mc/sec.
- Received 7 November 1960
DOI:https://doi.org/10.1103/PhysRev.121.1630
©1961 American Physical Society