Evidence for a stable negative ion of calcium

Pegg, D. J.; Thompson, J. S.; Compton, R. N.; Alton, G.D.

doi:10.1103/physrevlett.59.2267

Cited by 176 publications

(65 citation statements)

References 16 publications

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“…Further, they used the absorption potential of Staszewska et al [8], which is known to overestimate the flux loss to the electronic excited states for large-angle scattering, particularly at high incident energies. However, in their calculations, Kelemen et al [7] used the old measured value of 0.043 eV by Pegg et al [9] for the electron affinity of the Ca atom rather than the latest measured value of 0.0246 eV [10]. So, their calculation seems unreliable.…”

Section: Introductionmentioning

confidence: 94%

Elastic scattering of electrons by calcium atoms

et al. 2014

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The differential, total, and momentum transfer cross sections along with the minima in the differential cross sections (DCSs) and the Sherman function S() for the elastic scattering of electrons by calcium atoms have been calculated. These calculations are done within the framework of complex electron-atom optical potential and relativistic dynamics, in the energy range 1-2000 eV. The results obtained are in good agreement with the available experimental data and are better than the previous calculations in overall assessment. In the DCSs, the energies and angular positions of five critical minima have been confirmed. In the vicinity of these critical minima, nine maximum polarization points have been found within the range −0.90 ≤ S() ≤ +0.73. Near the critical minima, a strong energy dependence of maximum polarization points is found. PACS Nos.: 41.75.Fr, 34.80.Bm. Résumé : Nous avons calculé les sections efficaces différentielle, totale et de transfert de quantité de mouvement, ainsi que les minima dans les sections efficaces différentielles (DCSs) et la fonction de Sherman S(), pour la diffusion élastique d'électrons sur des atomes de calcium. Ces calculs ont été faits en dynamique relativiste avec un potentiel optique complexe électron-atome, pour des énergies allant de 1 à 2000 eV. Les résultats obtenus sont en accord avec les données expérimentales et globalement meilleurs que les calculs antérieurs. Nous confirmons l'énergie et la position angulaire de cinq minima critiques des DCSs. Dans le voisinage de ces minima critiques, nous avons trouvé neuf points de polarisation maximale dans le domaine −0.90 ≤ S() ≤ +0.73. Nous observons une forte dépendance en énergie des points de polarisation maximale près des minima critiques. [Traduit par la Rédaction]

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Section: Introductionmentioning

confidence: 94%

Elastic scattering of electrons by calcium atoms

et al. 2014

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“…Since Fischer et al (2) reported the electron affinity for the alkaline-earth element Ca from a multi-configuration HartreeFock (MCHF) calculation in almost perfect agreement with the measured electron affinity from an elegant experiment by Pegg et al (3), many publications evaluating electron affinities for the alkaline-earth elements, noble gases, and actinides have been published (4,5,(10)(11)(12). The theoretical calculations show that the singly charged negative ions for most atoms in the periodic table are stable, even for alkaline-earth elements, noble gases, and actinides.…”

Section: Introductionmentioning

confidence: 77%

Calculation of the second electron affinities of atoms

Guo¹,

Whitehead²

1990

Can. J. Chem.

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YUFEI GUO and M. A. WHITEHEAD. Can. J. Chem. 68, 1585 ( 1 990) The second electron affinities of the atoms helium to krypton are calculated using the self-interaction corrected generalized exchange local-spin-density functional theory with the correlation energy functional. The dependence of the second electron affinities of the elements 0 , S, and Se on the Watson sphere radius is discussed. The present results are compared with other theoretical values and experimental data for the elements helium through krypton.Key words: second electron affinity, density functional theory.

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“…(4.6), we also think that it is physically reasonable. In this connection, we mention an interesting observation that a negative ion with the last electron outside the closed shell has been found [22] …”

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confidence: 83%