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RESEARCH PRODUCT
Isotope shifts and hyperfine structure in calcium 4snp and 4snf F Rydberg states
P. MüllerWilfried NörtershäuserKlaus WendtBruce A. Bushawsubject
PhysicsIsotopePhotoionizationAtomic and Molecular Physics and OpticsIsotopes of calciumsymbols.namesakeIsotopic shiftKinetic isotope effectRydberg formulasymbolsPhysics::Atomic PhysicsRydberg stateAtomic physicsHyperfine structuredescription
Isotope shifts and hyperfine structure have been measured in 4snp 1 P1 and Rydberg states for all stable calcium isotopes and the radioisotope 41Ca using high-resolution laser spectroscopy. Triple-resonance excitation via Rydberg state was followed by photoionization with a CO2 laser and mass selective ion detection. Isotope shifts for the even-mass isotopes have been analyzed to derive specific mass shift and field shift factors. The apparent isotope shifts for 41Ca and 43Ca exhibit anomalous values that are n-dependent. This is interpreted in terms of hyperfine-induced fine-structure mixing, which becomes very pronounced when singlet-triplet fine-structure splitting is comparable to the hyperfine interaction energy. Measurements of fine-structure splittings for the predominant isotope 40Ca have been used as input parameters for theoretical calculation of the perturbed hyperfine structure. Results obtained by diagonalizing the second-order hyperfine interaction matrices agree very well with experimentally observed spectra. These measurements allow the evaluation of highly selective and sensitive methods for the detection of the rare 41Ca isotope.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-09-01 | The European Physical Journal D |