Properties of the HYSCORE spin echo signal

In hyperfine sublevel correlation spectroscopy (HYSCORE), the finite durati on of the microwave pulses Lads to an incomplete inversion of the electron spin magnetization by the third pulse, which results in a significant admix ture of stimulated ESEEM to HYSCORE ESEEM. This virtually unavoidable contr ibution of stimulated ESEEM seriously hampers the analysis of the modulatio n amplitudes in HYSCORE. In this work, we analyze the properties of the spi n echo signals contributing to the composite HYSCORE signal. Based on this analysis, we propose the strategies of HYSCORE data acquisition and process ing that allow one to practically eliminate the contribution of the stimula ted echo and make the HYSCORE ESEEM analyzable in quantitative terms. (C) 2 001 Academic Press.