Peak suppression in ESEEM spectra of multinuclear spin systems.

摘要: Abstract We have observed a disturbing suppression effect in three-pulse ESEEM and HYSCORE spectra of systems with more than one nucleus coupled to the electron spin. For such systems, signal contains internuclear combination peaks varying intensity. At same time, at basic frequencies are reduced intensity, up point complete cancellation. both HYSCORE, amplitude peak given depends not only on its modulation depth parameter k τ -dependent blind-spot term b , but also all other nuclei. Peaks nuclei shallow modulations can be strongly suppressed by deep modulations. This cross-suppression explains observation that 1 H often very weak or even undetectable presence strong 14 N peaks. Due this distortion intensities, analysed carefully. present theoretical analysis based product rules, numerical computations, illustrative experimental data Cu(gly) 2 . In experiments, impact cross alleviated proper choice values, remote echo detection, matched pulses.