Nuclear Magnetic Resonance Spectrum ofCo59in Metallic Cobalt Powders

The nuclear magnetic resonance spectrum of ${\mathrm{Co}}^{59}$ in metallic powders is presented. This spectrum contains three lines in addition to the already well-known line of ${\mathrm{Co}}^{59}$ in face-centered cubic cobalt (213.1 Mc/sec at 25°C). The other lines are higher in frequency, the highest located 10.0 Mc/sec above the fcc resonance and is much less intense than the fcc. This highest lying resonance is identified to be due to ${\mathrm{Co}}^{59}$ nuclei in hexagonal close-packed cobalt, and we qualitatively account for the lower intensity by examining the effect on the resonance of the nuclear quadrupole moment in a noncubic environment.