PECULIARITIES OF ENDOR IN THE INHOMOGENEO US MAGNETIC-FIELD

ENDOR of LiF crystals with F-centres were investigated in the inhomoge neous magnetic field. Spectra of samples with even paramagnetic centre distribution and samples with a diamagnetic ''hole'' were recorded. E NDOR signal dependences on the hole size and dc magnetic field were in vestigated. A theoretical expression for the ENDOR spectrum which desc ribed experimental dependences was obtained. It was applied for the an alysis of various cases which occurred at the ENDOR in the inhomogeneo us magnetic field. It was shown that the superlocalization effect, i.e . the narrowing of the observation region as compared to single resona nces, might take place in ENDOR.