Measurement of the electron affinity of thulium

Davis, V. T.; Thompson, J. S.

doi:10.1103/physreva.65.010501

Cited by 21 publications

(32 citation statements)

References 12 publications

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“…The results also support the prediction of the formation of Eu − by the attachment of a 6p electron as evidenced by the ensuing (7/2, 1/2) J =3,4 doublet, for which the present measurement indicates a splitting of 0.169 eV. These results are consistent with recent experimental measurements for the electron affinities of praseodymium [20] and thulium [21], whose negative ions are predicted to have an active electron configuration of 4f n 6p, where n is odd. The electron affinities of Pr, Tm and Eu are all near 1 eV and all three negative ions support at least one long-lived, bound excited state.…”

supporting

confidence: 92%

High-Speed Measurement of Refractive Index Using Dielectric Multilayer Films Deposited on Optical Fiber End

Kim¹,

Mizuno²,

Nakamura³

2012

Jpn. J. Appl. Phys.

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The electron affinity (EA) of europium has been measured using laser photodetachment electron spectroscopy. The EA of Eu( 8 S 7/2 ) was determined to be 1.053 ± 0.025 eV. The data also show that Eu − has at least one bound excited state with binding energy of 0.864 ± 0.024 eV relative to the ground state of the europium atom. The experimental results are consistent with recent EA measurements of lanthanide atoms whose anions are predicted to have [Xe](4f n 6p) (where n is odd) configurations.

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supporting

confidence: 92%

High-Speed Measurement of Refractive Index Using Dielectric Multilayer Films Deposited on Optical Fiber End

Kim¹,

Mizuno²,

Nakamura³

2012

Jpn. J. Appl. Phys.

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“…(1) In [2] it was concluded that both the measured and the calculated EAs for the lanthanide atoms Eu [4][5][6][7][8], Tb [9,10], Tm [11,12], Gd [5,10] and Nd [5,6,9], including the Nb [13][14][15][16] atom require reinterpretation. New recommended EA values for these atoms were presented.…”

Section: Introductionmentioning

confidence: 99%

Negative Ion Binding Energies in Complex Heavy Systems

Msezane

2018

Jour. Atomic Mole. Conden. Nano Phys.

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We review briefly the recent progress in the determination of accurate and reliable electron affinities (EAs) of complex heavy systems with the view of assessing the reliability of the existing measured and/or calculated EAs of these systems. We demonstrate using slow electron collisions with complex heavy systems a novel and robust approach to the determination of reliable EAs from negative ion formation. From the Regge-pole calculated elastic total cross sections (TCSs), characterized by Ramsauer-Townsend (R-T) minima, shape resonances and dramatically sharp resonances manifesting anionic formation, we extract the anionic binding energies (BEs) for the ground, metastable and excited anionic states formed during the collisions. The ground state anionic BEs located at the absolute values of the R-T minima are identified with the systems' EAs. Results for various complex heavy systems, including fullerene molecules are compared with available measurements and calculations.

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“…This situation is especially true for most of the lanthanide anions except La − and Ce − since the yields of the latter were found three orders of magnitude greater than those of other lanthanide anions14. In early 2000s, a series of measurements of EAs of lanthanides were attempted by Davis and Thompson, including Eu15, Tm16, and Pr17. EAs of ~1 eV were reported for these lanthanides, implying a relatively strong interaction between the extra electron and the neutral.…”

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confidence: 99%

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 the electron affinity of thulium

Cited by 21 publications

References 12 publications

High-Speed Measurement of Refractive Index Using Dielectric Multilayer Films Deposited on Optical Fiber End

High-Speed Measurement of Refractive Index Using Dielectric Multilayer Films Deposited on Optical Fiber End

Negative Ion Binding Energies in Complex Heavy Systems

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

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