Die Hyperfeinstruktur in den 4f7 6s 6p-Termen des Eu I und die elektrischen Kernquadrupolmomente von Eu151 und Eu153
AbstractThe hyperfine structure of the statesz10P11/2,z10P9/2,z10P7/2,z8P9/2,y8P9/2,y8P7/2,y8P5/2,z6P7/2,z6 6s P5/2 of the 4f7 6p configuration of EuI was investigated with a photoelectric recording Fabry Perot spectrometer using enriched isotopes of Eu151 and Eu153, which have been excited in liquid air cooled hollow cathodes. From the measurements the values for the nuclear quadrupole moments
$$Q(Eu^{151} ) = (1.16 \pm 0.08) \cdot 10^{ - 24} cm^2 $$
 and
$$Q(Eu^{153} ) = (2.92 \pm 0.20) \cdot 10^{ - 24} cm^2 $$
 could be derived.