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  • 31.20.Ej  (3)
  • 35.10.Fk  (1)
  • 35.10D  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Hyperfine structure in the configurations4f 4 6s 2 and4f 4 5d 6s of Nd I (1992)
    Springer
    The European physical journal 23 (1992), S. 19-27 
    Details
    ISSN: 1434-6079
    Keywords: 31.30.Gs ; 32.30.Jc ; 35.10.Fk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The high resolution laser-atomic-beam technique was used to investigate the hyperfine structure in Nd I 4f 46s 2 5 I,5 F,5 S and 4f 45d6s 7 L,7 K,7 I,7 H. The metastable states were populated by an arc discharge burning in the atomic beam. The measured hyperfine constantsA andB of the levels of 4f 46s 2 and 4f 45d6s allow a parametric analysis to be performed using the effective tensor operator formalism. The experimental radial integrals of the 4f and 5d electrons fit with those of the other lanthanides. The 4f radial integrals are in agreement with values of optimized Hartree-Fock-Slater calculations. The spectroscopic quadrupole moments of143Nd and145Nd are deduced from the 4f parameters:Q I =−0.610(21) b and −0.314(12) b, respectively. TheQ I resulting from the 5d parameter are in satisfactory agreement with these values. The hyperfine anomaly due to thes electron in 4f 45d 6s amounts to about 1%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436698
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Deterimation of tensor polarizabilities in the perturbed 4snd 1 D 2 Ca Rydberg series (1986)
    Springer
    The European physical journal 1 (1986), S. 145-150 
    Details
    ISSN: 1434-6079
    Keywords: 32.60S ; 35.10D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The tensor polarizabilities of the 4snd 1 D 2 Ca Rydberg states fromn=5 ton=19 have been measured using quantum beat spectroscopy at very low electric field strengths. The irregular behaviour of the polarizabilities is well reproduced by Coulomb approximation calculations. Using a quantum defect analysis, the strong variations of the tensor polarizabilities of themsnd 1 D 2 states of the alkaline earth atoms Ca, Sr, and Ba can be explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436547
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Second-order isotope shifts in the ground configuration of Nd I (1993)
    Springer
    The European physical journal 27 (1993), S. 1-7 
    Details
    ISSN: 1434-6079
    Keywords: 21.10.Ft ; 31.20.Ej ; 31.30.Gs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The isotope shift between all stable neodymium isotopes has been measured for 21 transitions in the Nd I spectrum by means of laser-atomic-beam absorption spectroscopy. A parametric analysis of the observed shifts in all the levels of the terms5 I,5 F, and5 S of the ground configuration 4f 46s 2 yields not only the magnetic parameterz 4f but, for the first time, also the effective electrostatic parametersa,b, andc. A more accurate value of the nuclear parameter λ148,150 (Nd)=0.369(20) fm2 is obtained from the investigation of a 4f 35d6s 2−4f 35d6s6p transition. The comparison of non-relativistic Hartree-Fock calculations with the experimental data yields a scaling factorS I * (Nd)=1.50(9) that agrees with the corresponding one from the hyperfine structure analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436756
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Isotope shift in hafnium I: Parametric analysis,ab initio calculation, and changes in nuclear charge radii (1987)
    Springer
    The European physical journal 7 (1987), S. 153-159 
    Details
    ISSN: 1434-6079
    Keywords: 21.10.Ft ; 31.20.Ej ; 31.30.GS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The isotope shift in the arc spectrum of hafnium was studied in 10 lines for the isotopes176Hf,178Hf, and180Hf by means of a photoelectric recording Fabry-Perot spectrometer with digital data processing. The observed shifts together with results from an earlier study were analyzed by means of the parametric method. The field shift difference between the terms 5d 3(4 F) 6s 5 F and3 F resulted in 17(2) mK for the isotope pair178,180Hf. This reflects the influence of a second-order effect which is described by the parameterg 2=−4.4(6) mK. The parameterz 5d , displaying the magnitude of spin-dependent effects in the isotope shift of 5d 36s, was found to be 0.8(2) mK for the same isotope pair. The experimental data are compared with results obtained from the non-relativistic Hartree-Fock method. The calculated electron densities describe the experimental field shifts with good accuracy. Hartree-Fock screening ratios for various types of transitions were used to evaluate changes in mean-square nuclear charge radii. The mean value ofλ 178,180≈δ〈r 2〉178,180 equals 0.069(10) fm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384581
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Field shifts in hafnium II (1991)
    Springer
    The European physical journal 18 (1991), S. 107-112 
    Details
    ISSN: 1434-6079
    Keywords: 21.10.Ft ; 31.20.Ej ; 31.30.Gs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By means of classical interference spectroscopy, using enriched isotope samples, the isotope shift between178Hf and180Hf has been measured for 33 transitions in the Hf II spectrum. For the pure Russell-Saunders terms 5d 26s 4 F and2 F the parametric analysis yields a field-shift difference of 17(2) mK produced by the second-order interaction of the electrostatic operator and the field-shift operator. Semi-empirical calculations based on the non-relativistic Hartree-Fock method reproduce this value as well as the experimental field shifts if a factor of 1.68(6) is used to scale theab initio electron densities at the nucleus. The corresponding factor for the Hf atom is much smaller. This leads to a re-evaluation of screening ratios for Hf and to a more accurate value of the nuclear parameter λ178,180 (Hf)=0.072(4) fm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418175
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    Paper (German National Licenses)
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