Hyperfine Spectrum of Chromium 53 inAl2O3

Abstract

Electron nuclear double-resonance techniques were used to observe the hyperfine spectrum of ${\mathrm{Cr}}^{53}$ in ${\mathrm{Al}}_2$ ${\mathrm{O}}_3$. Through analysis of the spectrum at zero degrees a positive value of 48.5±0.1 Mc/sec was obtained for the hyperfine coupling constant and -0.85±0.04 Mc/sec for the quadrupole coupling constant. From this a value of -0.03 barn was deduced for the quadrupole moment of ${\mathrm{Cr}}^{53}$.