Electron affinities of 6<i>p</i>electrons in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>

Dinov, Konstantin D.; Beck, Donald R.

doi:10.1103/physreva.51.1680

Cited by 17 publications

(9 citation statements)

References 12 publications

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“…Since relativistic effects are important in this system, the calculation was based on a relativistic configuration interaction (RCI) calculation which used as a zeroth-order starting point a multiconfigurational Dirac-Fock (MCDF) calculation. Lanthanides are best described by jj -coupling schemes, and for Pr − , a splitting in the (9/2, 1/2) J =4,5 doublet was predicted, where J = 4 was the total angular momentum predicted for the first excited state of Pr − [17]. Dinov and Beck [17] calculated this splitting to be 18 meV.…”

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confidence: 99%

“…That is, most calculations predict the formation of a stable lanthanide negative ion by the attachment of a 6p electron rather than a 4f electron, due to stronger effects of correlation between the 4f electrons which have relatively smaller orbital radii than their outer neighbours [16]. A recent theoretical calculation of the EA of Pr was made by Dinov and Beck [17]. Their calculation predicted the EA of Pr as 0.128 eV with a ground state configuration for Pr − of [Xe](4f 3 6s 2 6p) and a total angular momentum of J = 5 [17].…”

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confidence: 99%

“…A recent theoretical calculation of the EA of Pr was made by Dinov and Beck [17]. Their calculation predicted the EA of Pr as 0.128 eV with a ground state configuration for Pr − of [Xe](4f 3 6s 2 6p) and a total angular momentum of J = 5 [17]. Since relativistic effects are important in this system, the calculation was based on a relativistic configuration interaction (RCI) calculation which used as a zeroth-order starting point a multiconfigurational Dirac-Fock (MCDF) calculation.…”

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confidence: 99%

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Measurement of the electron affinity of praseodymium

Davis

Thompson

2001

J. Phys. B: At. Mol. Opt. Phys.

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The electron affinity (EA) of praseodymium (Pr) has been measured using laser photodetachment electron spectroscopy. The EA of Pr(4I9/2) was determined to be 0.962±0.024 eV. The data also show that Pr- has at least one bound excited state with a binding energy of 0.866±0.018 eV relative to the ground state of the Pr atom. The present experimental measurements are compared to a recent calculation of the electronic structure of Pr-.

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Measurement of the electron affinity of praseodymium

Davis

Thompson

2001

J. Phys. B: At. Mol. Opt. Phys.

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“…Except for the two leftmost lanthanides, La [5] and Ce [6], and the rightmost lanthanide, Lu [7], no modern result suggests ground state EA's exceeding 150 meV [4,[8][9][10], and bound excited states of Lanthanide anions are terra incognita. A recent extensive review of anions has been made by Andersen [11].…”

Section: Introductionmentioning

confidence: 97%

Three long-lived excited states ofTm−

O’Malley

Beck

2004

Phys. Rev. A

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Considering p, d, and f attachments to the 4f 13 6s 2 J = 7/2 ground state of Tm i, we find no evidence for bound Tm − states. A survey of possible weak attachments to excited Tm i states, however, suggests three long lived states created by 6p attachment to the 4f 12 5d6s 2 J = 15/2, 17/2 excited states. Calculated binding energies for these states are 254 meV for the J = 8 state relative to its 4f 12 5d6s 2 J = 15/2 threshold and 258 and 173 meV relative to the J = 17/2 threshold for J = 9 and J = 10, respectively. These high J 4f 12 5d6s 2 6p states have open decay channels only to 4f 13 6s 2 J = 7/2, 5/2 and 4f 12 5d6s 2 J = 9/2, resulting in emitted electrons of symmetry g, h, and i. The lifetimes for these long lived J = 8, 9, 10 states are estimated to be 9.8 µs, 0.9 ms, and 6.6 ms, respectively.

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“…Because of this complexity of the open 4f subshell (in some cases not yet fully collapsed), computational studies of negative ions have thus far been primarily relegated to the lower Z (La − [6,7], Ce − [8,9], and Pr − [10]) or higher Z (Tm − [11,12], Yb − [13][14][15][16], and Lu − [15,17,18]) ends of the Lanthanides. In an overly optimistic period following the expansion of the main RCI program [1] from a basis size of 7000 to 20 000, we attempted to study 6p attachments to both the odd parity ground state and the extremely low lying [19] even parity first excited state of Tb.…”

Section: Introductionmentioning

confidence: 99%

Calculations ofNd−binding energies and photodetachment partial cross sections

O’Malley

Beck

2008

Phys. Rev. A

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The electron affinity for neodymium is determined from relativistic configuration interaction calculations to be 169 meV, and six additional bound excited states are also predicted. These 6p attachments to the 4f 4 6s 2 neutral ground state configuration are carefully analyzed with respect to approximate LS total term and LSJ of the the 4f 4 subgroup. This analysis is used to drastically reduce the basis size of the calculations and preselect channels for potentially large photodetachment partial cross sections. Estimations of the effects of the mixing of resonance states in the partial cross section calculations suggest that for incident photon energies ∼2.0 eV or larger, 6s detachments to excited 4f 4 6s6p thresholds will represent the dominant channels of the total cross section.

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Electron affinities of 6pelectrons inPr−

Cited by 17 publications

References 12 publications

Measurement of the electron affinity of praseodymium

Measurement of the electron affinity of praseodymium

Three long-lived excited states ofTm−

Calculations ofNd−binding energies and photodetachment partial cross sections

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