Abstract
In order to determine the nuclear quadrupol moments of the stable K-isotopes, the hyperfine structure of the 4p and5p 2P3/2-states was investigated by resonance scattering of light. The scattered intensityR(H) from separated isotopes in a sealed off resonance cell, as function of an external magnetic fieldH was observed with different polarisations (σ- andπ-components perpendicular toH) both in exciting and scattered light.
Because the hfs-splitting of the investigated states is comparable to the radiation widthГ, the measured change in intensityΔR(H)/ΔH is due to interference effects (Hanle-effect, level-crossing, anti-crossing) and decoupling of electronic and nuclear spin (Heydenburg-effect). The different effects are not distinguishable in contrary to an usual level-crossing experiment and therefore the measured signal-structure is compared with line shape calculations according to Breit's-formula. Assuming “white” excitation andg J =4/3, the measured signal-structure can be explained with the following values:Γ/2π (4p)=5.7 (4) MHzΓ/2π (4p)=5.7 (4) MHz K39:A(4p)=6.13(5) MHzB(4p)=2.72(12) MHzA(5p)=1.97(2) MHzB(5p)=0.85 (3) MHz K41:A(4p)=3.40(8) MHzB(4p)=3.34(24) MHzA(5p)=1.08(2) MHzB(5p)=1.06 (4) MHz.
Without Sternheimer corrections one obtains from these values Q(K39)=0.062 · 10−24 cm2 and Q(K41)=0.076 · 10−24 cm2 for the electrical nuclear quadrupolmoments of K39 and K41.
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Herrn Prof. Dr. H.Bucka danke ich für zahlreiche klärende Diskussionen und sein stets förderndes Interesse an dieser Arbeit.
Die Deutsche Forschungsgemeinschaft stellte in dankenswerter Weise wertvolle Meßgeräte zur Verfügung.
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Ney, J. Hyperfeinstrukturuntersuchung der 4p und 5p 2 P 3/2-Terme im K I-Spektrum durch Resonanzstreuung von Licht zur Bestimmung der Kernquadrupolmomente von K39 und K41 . Z. Physik 223, 126–138 (1969). https://doi.org/10.1007/BF01392975
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DOI: https://doi.org/10.1007/BF01392975