Abstract
Numerical calculations are presented for the steady state as well as for the dynamic behavior of the magnetization of a two-spin model under strong rf irradiation. The relaxation mechanism considered is a scalar coupling between the two spins which becomes randomly time dependent due to rapid intermolecular exchange of one of them. Under resonance conditions, magnetization along the rf field is shown to exist also in the steady state. The relaxation process (i.e., the approach of the spin system towards its steady state) may be characterized by a simple time constant T 1 ϱ , provided that the irradiation strength is small compared to the relative chemical shift of the two spins. In this case, a formula for T 1 ϱ derived by Solomon for scalar relaxation due to quadrupole interaction of one nucleus holds also for our model. If the irradiation strength attains the order of magnitude of the chemical shift, the change of magnetization with time becomes very intricate.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
