Abstract
In electron spin resonance (ESR), refocusing experiments (1) led to the development of electron spin echo (ESE) spectroscopy which developed into a powerful tool for the study of relaxation and of hyperfine and quadrupole interactions (2). The main interest in electron spin echo experiments relies on the modulation of the echo envelope as a function of the pulse separation in a two- or three-pulse sequence. This modulation is caused by interactions which are not fully refocused by a pulse (2–4). To record an ESE modulation trace, the time between the microwave pulses is incremented from experiment to experiment, each providing one point of the trace. The measurement of a full echo envelope may therefore be time-consuming. The use of pulse trains for the simultaneous measurement of the entire echo envelope in analogy to Carr-Purcell experiments (5) is, unfortunately, often not feasible because of the extended dead-time disqualifying sampling between the pulses.
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