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  • 1
    Electronic Resource
    Electronic Resource
    Radiative lifetimes of the 6p 2 P 1 2/0 and 6p 2 P 3 2/0 levels in Yb II (1993)
    Springer
    The European physical journal 28 (1993), S. 283-284 
    Details
    ISSN: 1434-6079
    Keywords: 32.70.Fw ; 31.20. - d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Radiative lifetimes have been determined for the 62 P 1 2/0 and 62 P 3 2/0 levels in Yb II using the method of laser-induced fluorescence from sputtered metal vapour. The results, 8.0(2)ns (62 P 1 2/0 ) and 6.3(3)ns (62 P 3 2/0 ), are compared with lifetimes obtained from ab initio manybody perturbation calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437260
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  • 2
    Electronic Resource
    Electronic Resource
    Doppler free “dark resonances” for hyperfine measurements and isotope shifts in Ca+ isotopes in a Paul trap (1995)
    Springer
    The European physical journal 34 (1995), S. 227-232 
    Details
    ISSN: 1434-6079
    Keywords: 32.80.P ; 31.30.Gs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have observed “dark resonances” in theA-type level structure, formed by the 4S1/2 ground state, the 4P1/2 excited state and the low lying metastable 3D3/2 state in the Calcium ion, confined in a Paul radio-frequency trap. These Doppler-free and potentially very narrow resonances were used to determine the magnetic dipole hyperfine interaction constant A for the 4P1/2 and 3D3/2 state of43Ca+, giving −142(8) MHz and −48.3(1.6) MHz, respectively. From measurements of the P-D (E1) and S-D (E2) transition wavelength in a mixture of43Ca+ and40Ca+ we determined the isotope shifts of these lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437567
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  • 3
    Electronic Resource
    Electronic Resource
    Relativistic correlation effects on the hyperfine structure and electric dipole transitions in Cs and Tl (1990)
    Springer
    The European physical journal 15 (1990), S. 309-319 
    Details
    ISSN: 1434-6079
    Keywords: 35.10.F ; 32.70 ; 31.30 ; 31.20.T
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A discrete numerical basis set is a versatile tool for many-body calculations. Here it is used to calculate second-order energy corrections and to construct approximate Brueckner orbitals for Cs and Tl in a relativistic framework. These orbitals, which often account for a large part of the correlation effects, are then used to evaluate the hyperfine structure and electric dipole transition matrix elements for a few low-lying states. The correlation effects were combined with the RPA diagrams, which account for the response of the orbitals to the external perturbation, and the results are compared with other calculations and with experiment. For Cs, the results are in good agreement with earlier work, whereas for the more complicated system Tl we find significantly larger contributions from the modification of the valence orbitals to approximate Brueckner orbitals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437174
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  • 4
    Electronic Resource
    Electronic Resource
    Electron correlation effects in the 4f14 shell (1985)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 27 (1985), S. 665-675 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Second-order Rayleigh-Schrödinger Hartree-Fock perturbation theory is applied to evaluate the correlation energy for the 4f14 shell of Yb. The partial-wave (PW) increments to the pair energies, and the total correlation energy are calculated using first-order radial pair functions obtained as the solution of two-dimensional differential equations. These equations are solved using the Chalmers University version of the finite difference method. The total second-order correlation energy amounts to 0.89573 hartree. The results for the pair energies, which are close to the all-external pair energies, are compared with related CI values. It turns out that the correlation effects within the 4f shell of rare-earth systems are dominated by the all-external effects. The ff and gg PWS are dominant in the description of the correlation effects in the 4f shell and provide 80% of the total correlation energy. Next in importance are the dd, hh, and dg PWS which provide 12% of the total correlation energy.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560270604
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    Paper (German National Licenses)
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