Polarizability of Rn-like Th<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>from spectroscopy of high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>L</mml:mi></mml:mrow></mml:math>Rydberg levels of Th<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><

Measurements of the fine structure pattern in high-L, n = 37 Rydberg levels of Th 3+ have been extended and improved to allow more precise determinations of the dipole and quadrupole polarizabilities of the Rn-like Th 4+ core of the Th 3+ Rydberg system. The improved precision is partly due to the recent availability of theoretical calculations that limit the size of higher-order contributions to the fine structure pattern. The measured polarizabilities are α D = 7.702(6) a.u. and α Q = 29.1(1.9) a.u.

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“…The main difference from the previously reported values is a higher value of the [5]. e Reference [7]. f DHF; Reference [5].…”

contrasting

confidence: 56%

Measurements of dipole and quadrupole polarizabilities of Rn-like Th4+

et al. 2012

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“…The radon-like Th 4+ ion is the most common charge state of thorium in chemical compounds [1]. This work is motivated in part by recent experiments [2][3][4][5] that investigated the spectroscopy of high-L Rydberg levels of actinide ions and the dipole and quadrupole polarizabilities. These measurements present an excellent opportunity for benchmark tests of a priori theoretical descriptions of such highly relativistic ions.…”

Section: Introductionmentioning

confidence: 99%

“…In 2010, binding energies of high-L Rydberg levels of Th 3+ were measured using the resonant excitation stark ionization spectroscopy (RESIS) technique by Hanni et al [3]. Analysis of the data with the long-range polarization model was used to determine the dipole and quadrupole polarizabilities of the free Th 4+ ion, α d = 7.61 (6) a.u.…”

Section: Introductionmentioning

confidence: 99%

“…and α Q = 47 (11) a.u. [3]. To improve the precision of these properties, rf spectroscopy was used to directly measure intervals separating n = 37 levels of Th 3+ with 9 L 15 in [4].…”

Section: Introductionmentioning

confidence: 99%

“…The study of the high-L Rydberg levels of U 5+ using the RESIS technique [2] led to difficulties which were possibly caused by different numbers of metastable states in Th 4+ and U 6+ ions. Theoretical calculations of U 6+ atomic properties may aid further experimental studies.…”

Section: Introductionmentioning

confidence: 99%

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Correlation and relativistic effects in actinide ions

Safronova¹,

Safronova²

2011

Phys. Rev. A

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Wavelengths, line strengths, and transition rates are calculated for the multipole (E1, M1, E2, M2, E3, and M3) transitions between the excited 6s 2 6p 5 nl and 6s6p 6 nl states and the ground 6s 2 6p 6 state in Ac 3+ , Th 4+ , and U 6+ Rn-like ions. Relativistic many-body perturbation theory (RMBPT), including the Breit interaction, is used to evaluate energies and transition rates for multipole transitions in these hole-particle systems. The RMBPT method agrees with multiconfigurational Dirac-Fock (MCDF) calculations in lowest order, includes all second-order correlation corrections, and includes corrections from negative-energy states. The calculations start from a [Xe]4f 14 5d 10 6s 2 6p 6 Dirac-Fock potential. First-order perturbation theory is used to obtain intermediate-coupling coefficients, and second-order RMBPT is used to determine the matrix elements. Evaluated multipole matrix elements for transitions from excited states to the ground states are used to determine the line strengths, transition rates, and multipole polarizabilities. This work provides a number of yet unmeasured properties of these actinide ions for various applications and for benchmark tests of theory and experiment.

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Properties of Fr-like Th3+from spectroscopy of high-LRydberg levels of Th
Keele
¹
,
Hanni
²
,
Woods
³

et al. 2011
Phys. Rev. A
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Binding energies of high-L Rydberg states (L 7) of Th 2+ with n = 27-29 were studied using the resonant excitation Stark ionization spectroscopy (RESIS) method. The core of the Th 2+ Rydberg ion is the Fr-like ion Th 3+ whose ground state is a 5 2 F 5/2 level. The large-core angular momentum results in a complex Rydberg fine-structure pattern consisting of six levels for each value of L that is only partially resolved in the RESIS excitation spectrum. The pattern is further complicated, especially for the relatively-low-L levels, by strong nonadiabatic effects due to the low-lying 6d levels. Analysis of the observed RESIS spectra leads to determination of five properties of the Th 3+ ion: its electric quadrupole moment Q = 0.54(4); its adiabatic scalar and tensor dipole polarizabilities α d ,0 = 15.42(17) and α d ,2 = -3.6(1.3); and the dipole matrix elements connecting the ground 5 2 F 5/2 level to the low-lying 6 2 D 3/2 and 6 2 D 5/2 levels, | 5 2 F 5/2 ||D||6 2 D 3/2 | = 1.435(10) and | 5 2 F 5/2 ||D||6 2 D 5/2 | = 0.414(24). All are in atomic units. These are compared with theoretical calculations.

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Polarizability of Rn-like Th4+from spectroscopy of high-LRydberg levels of Th<

Cited by 6 publications

References 14 publications

Measurements of dipole and quadrupole polarizabilities of Rn-like Th4+

Measurements of dipole and quadrupole polarizabilities of Rn-like Th4+

Correlation and relativistic effects in actinide ions

Properties of Fr-like Th3+from spectroscopy of high-LRydberg levels of Th
Keele
¹
,
Hanni
²
,
Woods
³

et al. 2011
Phys. Rev. A
Self Cite
15
0
29
0
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Polarizability of Rn-like Th4+from spectroscopy of high-LRydberg levels of Th<

Cited by 6 publications

References 14 publications

Measurements of dipole and quadrupole polarizabilities of Rn-like Th4+

Measurements of dipole and quadrupole polarizabilities of Rn-like Th4+

Correlation and relativistic effects in actinide ions

Properties of Fr-like Th3+from spectroscopy of high-LRydberg levels of ThKeele1, Hanni2, Woods3 et al. 2011Phys. Rev. ASelf Cite150290View full textAdd to dashboardCite

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Properties of Fr-like Th3+from spectroscopy of high-LRydberg levels of Th
Keele
¹
,
Hanni
²
,
Woods
³

et al. 2011
Phys. Rev. A
Self Cite
15
0
29
0
View full text Add to dashboard Cite