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O’Malley, Steven M.; Beck, Donald R.

doi:10.1103/physreva.79.012511

Cited by 22 publications

(72 citation statements)

References 35 publications

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“…The fine structure splitting of the ground state of Ce on the difference between the binding energies of 4 H 7/2 (0.660 eV) and 4 H 9/2 (0.560 eV) [4]. It is also consistent with the MRCI calculation by Cao and Dolg of the energy difference between these two states of 0.109 eV [5].…”

Section: B Electron Affinity and Fine Structuresupporting

confidence: 87%

“…The resulting measured value for the electron affinity of Ce was 0.65(3) eV [17], confirming [4]. A cutoff of 10% is applied to the LS compositions to show only the leading LS terms.…”

Section: A Partial Energy Level Diagram Of Cementioning

confidence: 54%

“…R4 and R5) and the electric-dipole-forbidden J f =11/2 states are designated as "n/a". As shown, peak B is due to the lowest J f =5/2 resonance state; this J f =5/2 state was placed at 0.151 eV above its ground state and therefore bound by 0.001 eV in the most recent work of our group [4]. Estimating the accuracy of RCI to be 0.020 eV, the binding status of this state is actually ambiguous.…”

Section: B Photodetachment Cross Sectionmentioning

confidence: 97%

“…4 H 7/2 , 4 H 9/2 , and 4 I 9/2 -have been prepared earlier [4,14]. In this calculation, they are regenerated using the valence RCI method.…”

Section: A Many-electron Wave Functionmentioning

confidence: 99%

“…Theoretical calculations by O'Malley and Beck [4] predicted that the negative ion of cerium, Ce − , has multiple bound states of both odd configuration 4f 5d 2 6s 2 and even configuration 4f 5d6s 2 6p; Cao and Dolg [5] also calculated multiple bound states of opposite parity. The density of states in Ce − is unprecedented in atomic negative ions, because the shallow polarization potential of the neutral core typically supports only a single bound electronic configuration in most negative ions.…”

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confidence: 99%

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Experimental and theoretical study of bound and quasibound states ofCe−

Walter

Gibson

et al. 2011

Phys. Rev. A

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The negative ion of cerium is investigated experimentally with tunable infrared laser photodetachment spectroscopy and theoretically with relativistic configuration interaction in the continuum formalism. The relative cross section for neutral atom production is measured with a crossed ionbeam-laser-beam apparatus over the photon energy range 0.54 -0.75 eV. A rich resonance spectrum is revealed near threshold, with at least twelve peaks observed due to transitions from bound states of Ce − to either bound or quasi-bound excited states of the negative ion. Theoretical calculations of the photodetachment cross sections enable identification of the transitions responsible for the measured peaks. Two of the peaks are due to electric-dipole-allowed bound-bound transitions in Ce − , making cerium only the second atomic negative ion that has been demonstrated to support multiple bound states of opposite parity. In addition, combining the experimental data with the theoretical analysis determines the electron affinity of cerium to be 0.628(10) eV and the fine structure splitting of the ground state of Ce − ( 4 H 7/2 -4 H 9/2 ) to be 0.09775(4) eV.

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Section: B Electron Affinity and Fine Structuresupporting

confidence: 87%

“…The resulting measured value for the electron affinity of Ce was 0.65(3) eV [17], confirming [4]. A cutoff of 10% is applied to the LS compositions to show only the leading LS terms.…”

Section: A Partial Energy Level Diagram Of Cementioning

confidence: 54%

Section: B Photodetachment Cross Sectionmentioning

confidence: 97%

“…4 H 7/2 , 4 H 9/2 , and 4 I 9/2 -have been prepared earlier [4,14]. In this calculation, they are regenerated using the valence RCI method.…”

Section: A Many-electron Wave Functionmentioning

confidence: 99%

mentioning

confidence: 99%

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Experimental and theoretical study of bound and quasibound states ofCe−

Walter

Gibson

et al. 2011

Phys. Rev. A

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Direct experimental observation of weakly-bound character of the attached electron in europium anion

Cheng

Castleman

2015

Sci Rep

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Direct experimental determination of precise electron affinities (EAs) of lanthanides is a longstanding challenge to experimentalists. Considerable debate exists in previous experiment and theory, hindering the complete understanding about the properties of the atomic anions. Herein, we report the first precise photoelectron imaging spectroscopy of europium (Eu), with the aim of eliminating prior contradictions. The measured EA (0.116 ± 0.013 eV) of Eu is in excellent agreement with recently reported theoretical predictions, providing direct spectroscopic evidence that the additional electron is weakly attached. Additionally, a new experimental strategy is proposed that can significantly increase the yield of the lanthanide anions, opening up the best opportunity to complete the periodic table of the atomic anions. The present findings not only serve to resolve previous discrepancy but also will help in improving the depth and accuracy of our understanding about the fundamental properties of the atomic anions.

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Measurement of electron affinity of atomic lutetium via the cryo-SEVI Method

Tang

et al. 2019

Chinese Journal of Chemical Physics

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Electron affinities (EAs) of most lanthanide elements still remain unknown due to their relatively low EA values. In the present work, the cryogenically controlled ion trap is used for accumulating atomic lutetium anion Lu − , which makes the measurement of electron affinity of lutetium become practicable. The high-resolution photoelectron spectra of Lu − are obtained via the slow-electron velocity-map imaging method. The electron affinity of Lu is determined to be 1926.2(50) cm −1 or 0.23882(62) eV. In addition, two excited states of Lu − are observed.

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Valence calculations of lanthanide anion binding energies:6pand6sattachments to4fm

Cited by 22 publications

References 35 publications

Experimental and theoretical study of bound and quasibound states ofCe−

Experimental and theoretical study of bound and quasibound states ofCe−

Direct experimental observation of weakly-bound character of the attached electron in europium anion

Measurement of electron affinity of atomic lutetium via the cryo-SEVI Method

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