Analysis of three-pulse electron spin-echo modulation: Phase reversal

Abstract

Abstract Three-pulse electron spin-echo modulation patterns are analyzed with particular attention paid to the phase reversal of the modulation. For zero isotropic hyperfine coupling a simple expression is derived which relates the time of phase reversal to the dipolar distance to the interacting magnetic nuclei. However, even a small isotrophc hyperfine coupling dramatically affects the time of phase reversal. The absence of phase reversal in the three-pulse echo modulation from trapped electrons in methyltetrahydrofuran glass is shown to be consistent with the results obtained from two-pulse echo modulation studies.