On the Magnetic Moments of C13, F19, Tl203, and Tl205

Abstract

The resonance absorption method has been applied to the measurement of the moments of ${\mathrm{C}}^{13}$, ${\mathrm{F}}^{19}$, ${\mathrm{Tl}}^{203}$, and ${\mathrm{Tl}}^{205}$ in terms of the proton moment. The observed ratios of $g$-factor to that of the proton are as follows. ${\mathrm{C}}^{13}$: 0.25143±0.00005; ${\mathrm{F}}^{19}$: 0.94077±0.0001; ${\mathrm{Tl}}^{203}$: 0.571499±0.00005; ${\mathrm{Tl}}^{205}$: 0.577135±0.00005. By taking 5.5791±0.0016 for the proton gyromagnetic ratio, the values of the moments in nuclear magnetons are: $\mu \left({\mathrm{C}}^{13}\right)=0.7016\mathrm{}\pm 0.0004$; $\mu \left({\mathrm{F}}^{19}\right)=2.626\mathrm{}\pm 0.001$; $\mu \left({\mathrm{Tl}}^{203}\right)=1.612\mathrm{}$; $\mu \left({\mathrm{Tl}}^{205}\right)=1.628\mathrm{}$. For the thallium isotopes, $\frac{{\mu }_{205}}{{\mu }_{203}}=1.00986\mathrm{}\pm 0.00005$. The results for ${\mathrm{C}}^{13}$ and ${\mathrm{F}}^{19}$ are in close agreement with the molecular-beam values.