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 N-14 I, II, AND III

High-resolution spectroscopy studies of hyperfine structures of stable terms in N-14 I, II, and III by quantum-beat and rf resonance spectro scopy after grazing-ion-surface scattering are reported on. From the d ata, the electric quadrupole moment of the N-14 nucleus Q = 20.0+/-0.2 mb and the quadrupole coupling constants eQq(at)/h of N-14 atoms in 2 p and 2p2 configurations have been deduced. Extrapolation yields eQq(a t)/h = 11.2+/-0.2 MHz for a single electron in the ground term of the 2p3 configuration of the neutral atom.