Quadrupolar Splitting of the Al27 and Be9 Magnetic Resonances in Beryl Crystals

The quadrupolar hyperfine structure of the Al²⁷ and Be⁹ nuclear magnetic resonance peaks in beryl crystal at 300°K have been examined. From the observed spectra, the following values were obtained for the nuclear spins I, the effective nuclear magnetic moments μ, the nuclear quadrupole coupling constants eQ[open phi]_zz, and the electric field asymmetry parameters η: $$\begin{array}{c}{\mathrm{Al}}^{27}\text{:\hspace{0.17em}\hspace{0.17em}I=5/2,\hspace{0.17em}\hspace{0.17em}|μ|=3.6385±0.0003\hspace{0.17em}}\mathrm{n.m.},\\ {\mathrm{|eQ[open\; phi]}}_{\mathrm{zz}}\text{|=3.093±0.015\hspace{0.17em}}\mathrm{Mc}/\sec \text{,\hspace{0.17em}\hspace{0.17em}η=0.000±0.005.}\\ {\mathrm{Be}}^9\text{:\hspace{0.17em}\hspace{0.17em}I=3/2,\hspace{0.17em}\hspace{0.17em}|μ|=1.774±0.0002\hspace{0.17em}}\mathrm{n.m.},\\ {\mathrm{|eQ[open\; phi]}}_{\mathrm{zz}}\text{|=0.504±0.004\hspace{0.17em}}\mathrm{Mc}/\sec \text{,\hspace{0.17em}\hspace{0.17em}η=0.090±0.005.}\end{array}$$