Radio-Frequency Zeeman Effect inO2

The molecular-beam magnetic resonance method has been used to study the Zeeman effect of the rotational states of ${\mathrm{O}}_2$. The ratio of the $g$-value of the rotational magnetic moment to that of the electron-spin moment was found to be $\frac{g_K}{g_S}=+(6.08\mathrm{}\pm 0.74)\times {10}^{-5\mathrm{}}$. The ratio of the $g$-value of the unpaired-electron spin moments in ${\mathrm{O}}_2$ to that of the free-electron spin moment was found to be $\frac{g_S\left({\mathrm{O}}_2\right)}{g_s\left(\mathrm{free}\right)}=1-(190\mathrm{}\pm 13)\times {10}^{-6\mathrm{}}$.