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Nutation-Frequency Correlated EPR Spectroscopy: The PEANUT Experiment

1998; Elsevier BV; Volume: 130; Issue: 1 Linguagem: Inglês

10.1006/jmre.1997.1285

1096-0856

Stefan Stoll, Gunnar Jeschke, Michael Willer, A. Schweiger,

Spectroscopy and Quantum Chemical Studies

The phase-inverted echo-amplitude detected nutation (PEANUT) experiment for the measurement of transient electron spin nutation frequencies is introduced. In this new pulse sequence, nutation refocused to a rotary echo is detected via the amplitude modulation of a primary electron spin echo. Since detection and excitation of the nutation are fully separated in time, experiments at very high nutation frequencies become feasible. The nutation frequencies which are proportional to the transition moment of an EPR transition can be used to label individual EPR lines by an additional parameter. Using a two-dimensional PEANUT experiment which correlates the nutation frequencies with the resonance fields, the interpretation of complicated field-swept EPR spectra can considerably be simplified. A theoretical description of the experiment is given and the inner working of the approach is described. The predicted features of PEANUT spectra are verified experimentally and examples of applications to both ordered and disordered systems are given.