High-resolution quantum-beat and rf resonance spectroscopy after grazing-ion–surface scattering and its application in studies of the hyperfine structure of stable terms in ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ i, ii, and iii

High-resolution spectroscopy studies of hyperfine structures of stable terms in ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ i, ii, and iii by quantum-beat and rf resonance spectroscopy after grazing-ion–surface scattering are reported on. From the data, the electric quadrupole moment of the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ nucleus Q=20.0±0.2 mb and the quadrupole coupling constants ${\mathit{eQq}}_{\mathrm{at}}$/h of ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ atoms in 2p and 2${\mathit{p}}^2$ configurations have been deduced. Extrapolation yields ${\mathit{eQq}}_{\mathrm{at}}$/h=11.2±0.2 MHz for a single electron in the ground term of the 2${\mathit{p}}^3$ configuration of the neutral atom.