Abstract
Some quite general programs have been written, using the density matrix approach, for the computer simulation of multipulse, and Fourier transform NMR experiments. Intramolecular dipolar relaxation and relaxation by an external random field are explicitly included. In the present paper we restict ourselves to AX and AB spin systems although the programs themselves can handle larger spin systems. The following experiments are considered specifically. (1) The effects of random decoupling on an AX system including both line-shape effects and Overhauser effects. (2) The time development of the Overhauser effect after the decoupling field has been turned on. (3) The 180°-τ-90° pulse sequence for AX and AB systems with selective and nonselective 180° pulses. (4) The effects of finite pulse power for a 90° pulse applied to an AB system. Machine computation of the relaxation matrix is considered in an Appendix.
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