Asymmetry of the Quadrupole Satellite Lines of 23Na in NaNO2

The line shapes of the quadrupole-split lines of 23 Na in NaNO 2 have been measured at room temperature with the applied magnetic field along the a and c axes. Asymmetry of two observed satellite lines is compared with a calculation based on a two-spin Hamiltonian with the dipole coupling between adjacent 23 Na nuclei along the a direction. The result shows that the signs of components of the electric field gradient at the 23 Na site are positive for V a a and V c c , and negative for V b b .