Cross relaxation study on NaClO3 by NMR acoustic saturation

Cross relaxation rate between adjacent NMR lines of Na²³ in NaClO₃ was measured at room temperature by the NMR acoustic saturation method. When the angle φ between the [010] axis and H₀ in the (100) plane is 1.75°, two of the three NMR lines are superposed exactly. As φ is increased gradually, they split and they separate perfectly at φ = 2.75°. Cross relaxation probability between these two lines was measured as a function of the separation. The results are compared with the theory of overlap integral approximation. For small separation the theory reproduces fairly well the experimental results, but for larger separation disagreement appears, which may be due to the Gaussian approximation to the NMR line shape in the theory.