By means of a Fabry-P~rot-interferometer the hyperfine structure of 10 lines of the Eu-II-spectrum was analysed and from the results splitting factors and isotope shifts were calculated. When evaluating the magnetic moment /z of Eu 1 1 it was found that the two ground states (a~ ~ and a :S ~ of the Eu-II yield two distinctly different values for/z. This discrepancy can be removed assuming that a different electronic splitting factor (a~s) has to be attributed to the 6s-electron in each of these two states.A. Die Aufspaltungsfaktoren der Grund-und 610-Terme Zur Erlangung des magnetischen Kerndipol-und elektrischen Quadrupolmomentes der Eu-Isotope wurden einige frtihere Hyperfein-[u -II 6pz~ @ zeP s z f 5,fl, "

(1 -eP 9 ( " ) = 1 +~2 -2~~0 4 2 X 3 -1 ; * @ *hZn5'

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Inelastic neutron scattering spectra of pure and deuterated lithium hydroxides and of Ca(OH)2, Ca(OD)2, and Mg(OH)2 are presented. These spectra are explained by the interaction of neutrons with lattice vibrations in the scatterers. Special emphasis is given to the part of the spectra which is predominantly influenced by vibrations of the hydrogen layer atoms.