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  • 31.30.Gs  (3)
  • 32.70.Cs  (1)
  • 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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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Radiative lifetimes of levels of the configuration 4f 7 (8 S) 6s 6p in Eu I (1987)
    Springer
    The European physical journal 6 (1987), S. 31-34 
    Details
    ISSN: 1434-6079
    Keywords: 32.70.Cs ; 32.70.Fw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Radiative lifetimes of the 4f 7 (8 S) 6s 6p z 10 P 7/2, 9/2,z 8 P 5/2, 7/2, 9/2 andz 6 P 7/2, 5/2 levels of Eu I were measured by the time resolved recording of the exponential decay of the fluorescence. Three of them were measured for the first time, the others agree with previous determinations. From the values of the lifetimes absolute oscillator strengths are deduced, taking into account the branching ratios for the transitions to the 4f 7 6s 2 and 4f 7 5d 6s levels. From these absolutef values the radial integralI(6s 2, 6s 6p) was derived by a parametric analysis. Theoretical values of oscillator strengths which were calculated using this radial integral show good agreement with the experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436994
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    Paper (German National Licenses)
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