Abstract
A three-pulse and a four-pulse sequence for measuring nuclear modulation effects in pulsed EPR spectroscopy are proposed. The schemes make use of a combination of selective and nonselective microwave pulses to create and detect nuclear coherence. Both approaches are free of the suppression effect and are distinguished by an adjustable orientation selectivity for disordered systems. Phase problems do not exist in the four-pulse scheme, since the instrumental dead time is not relevant in this experiment. Qualitative descriptions of the experiments are given and analytical expressions are derived. The predicted features are verified experimentally.
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