Precision measurement of the hyperfine structure andgJfactor of atomic nitrogen 14

Abstract

The dipolar and quadrupolar hyperfine coupling constants, $A$ and $B$, respectively, and the atomic $g_J$ factor have been measured for the ${}_{}{}^4{}_{}{}^{}S_{\frac{3}{2}}^{}{}_{}{}^{}$ ground state of atomic nitrogen 14. An atomic hydrogen maser oscillating at the $\Delta M_F=-1\mathrm{}$ transition in a magnetic field ranging from 0.008 to 8 G was used as a detector of transitions in both hydrogen and nitrogen. The magnetic field was calibrated by the hydrogen Zeeman transition frequency. Values of the constants were found to be $A=10450\mathrm{}929.12\left(10\right)\mathrm{}$ Hz, $B=1.27\mathrm{}\left(10\right)\mathrm{}$ Hz, and $g_J=2.002\mathrm{}134652\left(64\right)\mathrm{}$. These results are compared to current theoretical results and other experimental measurements.