in KC1 as Measured by ENDOR BY
R. KERSTENThe isotropic and anisotropic hyperfine constants of the nuclei surrounding the F-centre in KC1 were newly determined by electron nuclear double resonance (ENDOR) in a region within the distance of three lattice constants around the centre (up to nuclei 003). Quadrupole interactions of nuclei 002, 102, and 112 could be measured.Die isotropen und anisotropen Hyperfein-Konstanten der Kerne in der Umgebung des F-Zentrums in KCl wurden mit Elektronen-Kern-Doppel-Resonanz (ENDOR) in einem Bereich von drei Gitterkonstanten um das Zentrum (bis zu Kernen 003) erneut beatimmt. Quadrupol-Wechselwirkungen fiir die Kerne 002, 102 und 112 konnten gemessen werden.
IntroductionThe F-centre in KC1 has an absorption line in electron spin resonance (ESR) which is inhomogeneously broadened by the magnetic coupling to the surrounding lattice nuclei, the main contribution to the line width arising from the six nearest neighbour potassium nuclei (shell 1)l) [l]. The method of electron nuclear double resonance (ENDOR) has turned out to be a powerful tool for the determination of these interactions which cannot be resolved by ESR. It is essentially a nuclear magnetic resonance of the nuclei coupled to the paramagnetic centre, using the desaturation of the simultaneously observed ESR signal for its detection [2, 3, 41. The method was invented by Feher
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