Abstract
Electron spin-echo techniques have been successfully applied to the study of disordered systems mainly due to the nuclear modulation of the echo signal, the analysis of which gives information on the structural arrangement around the paramagnetic center. Most applications to date have been carried out at X-band (≈9 GHz). Here we report on the analysis of two and three pulse modulation patterns simulated at S-band (≈3 GHz) for which the modulation depth is about tenfold deeper and more quantitative analysis ofI=1/2 nuclei becomes possible. The investigation is applied to two different nuclei of experimental interest at different electron-nucleus distances, and comparison is done with the corresponding X-band patterns.13C and15N nuclei, both with nuclear spin quantum valueI=1/2, are chosen due to their different nuclearg-factors that produce quite different modulation periods. Modulation features due to isotropic hyperfine couplings are also analyzed. It is shown that in several cases complicated patterns arise, that are successfully interpreted by Fourier transform in the frequency domain. Some conclusions are drawn concerning the experimental conditions under which the use of S-band is really of significant advantage with respect to X-band.
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Romanelli, M., Kevan, L. Electron spin-echo envelope modulation at S-band. 1: Analysis of hyperfine interaction effects. Appl. Magn. Reson. 3, 1079–1097 (1992). https://doi.org/10.1007/BF03166175
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DOI: https://doi.org/10.1007/BF03166175