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A cw high-power ENDOR spectrometer is described. Freed's theory of coherence effects on ENDOR line shapes of free radicals in solution was tested with cw NMR fields up to 30 Gauss. The neutral radical Perinaphthenyl (PNT) with groups of three and six equivalent protons served as example. A satisfactory agreement with the theory was found, even in quantitative terms. Very reasonable values for relaxation times T 1e  , T 2e  and T 1n  of the PNT could be determined by fitting Te -1 /W e , W n /W e  and using measured values for B MW,  B NMR  and the EPR line width.

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Einfluß von Kohärenzeffekten auf die Linienformen im ENDOR-Spektrum des Perinaphthenyl-Radikals / Influence of Coherence Effects On Line Shapes in the ENDOR Spectrum of the Perinaphthenyl Radical