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The electronic triplet state sublevels of aromatic molecules generally have different energies already at zero external magnetic field. This zero field splitting usually is too small to be resolved by a high resolution optical spectrometer, and only a high magnetic field (typically 30 kG) yields enough Zeeman-splitting to allow full resolution. From the Zeeman pattern one can extract the absolute sign of the triplet parameter D, which probes the electronic wavefunction of the triplet state.

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Direkte Bestimmung des absoluten Vorzeichens des Triplett- Nullfeld-Parameters D mit hochauflösender optischer Detektion von ESR / Direct Determination of the Absolute Sign of the Triplet Zero Field Parameter D by High Resolution Optical Detection of ESR