gJfactor of metastableS25atomic oxygen using a time-of-flight, atomic-beam magnetic-resonance method

A time-of-flight, atomic-beam magnetic-resonance method was used to compare the $g_J$ factor of $2p^{3}3s{}_{}{}^5{}_{}{}^{}S_2^{}{}_{}{}^{}$ atomic oxygen with the $g_J$ factor of metastable $2{}_{}{}^3{}_{}{}^{}S_1^{}{}_{}{}^{}$ atomic helium in magnetic fields of 3209 and 4228 G. The metastable oxygen and helium atoms were produced in a pulsed radio-frequency discharge source and after traversing the apparatus were detected by electron emission from a tungsten surface. By collecting data only in a given interval of the time-of-flight distribution the $\mathrm{O}\left({}_{}{}^5{}_{}{}^{}S\right)$ and $\mathrm{He}\left({}_{}{}^3{}_{}{}^{}S\right)$ states were isolated from other discharge products. From 158 pairs of resonances taken with four relative field and hairpin orientations the atomic magnetic $g$ factor is $g_J({}_{}{}^5{}_{}{}^{}S_2^{}{}_{}{}^{}, {}_{}{}^{16}{}_{}{}^{}\mathrm{O})=\frac{{\mu }_J}{J}=-2.002\mathrm{}0910\left(10\right)\mathrm{}$.