Hyperfine structure in the 6p5d configuration and isotope shifts in transitions between the 6s5d and the 6p5d configurations in Ba I

Grundevik, P.; Lundberg, Hans; Nilsson, L.; Olsson, Gunnar

doi:10.1007/bf01415122

Cited by 32 publications

(40 citation statements)

References 35 publications

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“…Further, a comparison of experimental slopes of lines, obtained by a King plot analysis, was found to be reproduced well by these wave functions. Also the J-dependence of the volume IS of the resonance transitions in BaII was found to be in complete agreement with the experimental values [18,19]. These calculations are extended at present to all elements in group IIa and IIb of the periodic table [20].…”

supporting

confidence: 57%

Volume isotope shifts in low lying transitions of Au I

Rosén¹,

Fricke

Torbohm

1984

Z Physik A

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Electronic factors in the volume isotope shift have been calculated in an ab initio way with the relativistic Dirac-Fock method for a number of different optical single/and two-photon transitions in Au I. The agreement with a semi-empirical method is within 10 % for the resonance transition. For this one and a few other transitions the effect of core excitation has been analyzed with the Multi-configuration Dirac-Fock method as well, and it was found to reduce the electronic factor in the order of 5 %.Programs for measurements of nuclear spins, hyperfine structure constants, and isotope shifts (IS) for series of neutron-deficient as well as neutron-rich isotopes have been going on during the last years at the ISOLDE facility at CERN [1][2][3][4][5]. The objective of these investigations is to get information on the single particle structure of the investigated nuclei, to follow trends of nuclear properties for series of isotopes, and isotones as well as to test the validity of different nuclear models [6]. The measurements give the nuclear spins directly, while the evaluation of nuclear moments for a certain isotope, and change of nuclear charge radii between isotopes, requires knowledge of the electronic factor for that particular interaction [7]. The magnetic ground state hyperfine structure, and the nuclear spins have been determined for a number of radioactive Au-isotopes [8][9][10] by the atomicbeam magnetic-resonance method. Information about the quadrupole moment exists only for the stable isotope 197Au [11]. Recently [12][13][14] IS have been measured in the resonance line between 19VAu (stable), and 19SAu (T1/2 = 183d) isotopes at Mainz as a pilot project of systematic IS-measurements for a series of short-lived Au-isotopes at the ISOLDE facility. In this project measurements are planned also for some 6s-ns two-photon transitions. Nuclear data properties, derived from these measurements, then are planned to be used for comparison with data for neighbouring isotopes of Os, Ir, Pt, Hg, TI, and Pb [5,6].Recently, relativistic Multi-configuration Dirac-Fock (MCDF) wave functions, coupled to good angular momentum J, have been obtained for low lying states of Ba I and Ba II [15]. Good agreement was achieved with an electronic factor for the volume isotope shift, evaluated from isotope shifts in muonic X-rays [16], although there is some discrepancy to more recently published muonic X-ray data [17]. The reason for this discrepancy is at present not understood. Further, a comparison of experimental slopes of lines, obtained by a King plot analysis, was found to be reproduced well by these wave functions. Also the J-dependence of the volume IS of the resonance transitions in BaII was found to be in complete agreement with the experimental values [18,19]. These calculations are extended at present to all elements in group IIa and IIb of the periodic table [20]. As a continuation of those calculations we present in this paper electronic factors for a number of transitions within the AuI spectrum, which will be usef...

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confidence: 57%

Volume isotope shifts in low lying transitions of Au I

Rosén¹,

Fricke

Torbohm

1984

Z Physik A

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“…In the 5s4d~5s6p (7,167~_) An alternative way of estimating the SMS in the 7,167A transition is to use the intercept from the King plot analysis (7) together with an independent estimation of the SMS in the 7,309A transition. In the recent investigations of transitions between the 6s 5d and 6p 5d configurations in Ba I the SMS was found to be about zero [3]. If we assume that the same is true for the 7,309A transition in Sr (between the 5s4d and 5p4d configurations) the SMS in the 7,167]t transition would be -237MHz using (7).…”

Section: Isotope Shift Analysismentioning

confidence: 84%

“…In this paper we also give experimental hfs constants for the 5p4dlD2 state. However, this configuration is expected to be strongly disturbed as is the corresponding configu ration 6p5d in Ba [3,4]. Therefore, the hfs in this state is not analysed in this paper.…”

Section: Hyperfine Structure Analysismentioning

confidence: 93%

“…For an interpretation of these shifts the magnitude of the different contributions to the IS has to be analysed more closely. Following the conventions in [3], the experimental IS in an atomic transition is given as…”

Section: Isotope Shift Analysismentioning

confidence: 99%

“…Accurate hfs measurements in the metastable 6s5d3D3,2,1 states of 135Ba and 13VBa [1] and in the 4s4p 3P z state of 43Ca [-2] have earlier been performed in our group, using the atomic-beam magnetic-resonance (ABMR) method. These investigations have also been extended with high-resolution laser spectroscopy measurements in several transitions between the 6s5d and 6p5d configurations in Ba I [3,4]. High-precision hfs measurements in Sr were earlier performed by zu Putlitz [-5] and Heider and Brink [6] within the 5s5p3P~ and 3P z states, respectively, using the optical double resonance and the ABMR methods.…”

Section: Introductionmentioning

confidence: 98%

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Radio-frequency and laser spectroscopy studies of low-lying states in SrI

et al. 1983

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Precision hyperfine structure (hfs) measurements in the 5s4d 1D 2 metastable state of STSr were performed using the laser radio-frequency double resonance method. The magnetic dipole and electric quadrupole interaction constants were found to be a= -5.5734(4) MHz and b = 55.421(6) MHz. In addition high-resolution laser spectroscopy experiments were performed in the 5s4d ~D2 ~--~ 5s6 p 1p~ and 5s4d IDz +-+ 5p4d aD z transitions in SrI. The isotope shifts in the transitions and the hfs in the upper states were determined. Comparison of the experimental results with corresponding relativistic selfconsistent-field (SCF) calculations shows that the states involved are very strongly perturbed. Therefore no reliable nuclear quadrupole moment for STSr can be deduced from the data presented here without more detailed calculations. A relativistic SCF calculation of the electron density at the nucleus was used in combination with muonic values of the nuclear mean square radii to evaluate the field shifts. From the experimental isotope shifts the specific mass shifts in the two transitions can then be deduced. This shift was found to be particularly large in the transition 5s4d aDz+-*5s6 p 1P 1 .

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Isotope Shifts in Atomic Spectra

King¹

1984

403

400

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Hyperfine structure in the 6p5d configuration and isotope shifts in transitions between the 6s5d and the 6p5d configurations in Ba I

Cited by 32 publications

References 35 publications

Volume isotope shifts in low lying transitions of Au I

Volume isotope shifts in low lying transitions of Au I

Radio-frequency and laser spectroscopy studies of low-lying states in SrI

Isotope Shifts in Atomic Spectra

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