Elastic scattering of electrons and positrons by the Ca atom

Khare, S. P.; Kumar, Ashok; Vijayshri,

doi:10.1088/0022-3700/18/9/016

Cited by 17 publications

(71 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 9b shows the angular dependence of the Sherman function for three energies, from our calculations, in the vicinity of the high angle CM at 139 eV (Table 1). It is seen that all three curves agree fairly closely with one another and with the calculated values of [4]. An important feature of the critical angles is that only in the vicinity of these angles a noticeable difference between extremal values of the S() function is perceptible.…”

Section: Spin Polarizationsupporting

confidence: 78%

“…The relativistic treatment of electron collisions enables us to calculate the asymmetry function or the so-called Sherman function, which describes the measured spin-up and spin-down Figure 1 shows the total elastic el and momentum transfer m cross sections calculated within the framework of complex optical potential and compared with the theoretical [2,4,7,11,14] and experimental [2] values. One can see from Fig.…”

Section: Theorymentioning

confidence: 99%

“…The theoretical descriptions and calculations reported later are mainly based on optical potential approximation and several approximations were performed with different choices of potentials. Khare et al [4] used the optical model calculation to calculate the differential and integral elastic cross sections, critical points, the direct and spin-flip scattering amplitudes (f and g) and spin polarization parameters in the energy range from 10 to 500 eV. They only used the real part of the optical potential including static, exchange, and polarization potentials.…”

Section: Introductionmentioning

confidence: 99%

“…The density required for the static, exchange, polarization, and imaginary part of the full potential is obtained numerically from the multiconfiguration DF wavefunctions [19]. The results of our calculations of various cross sections as well as Sherman functions are compared with the only experimental data [2] and available theoretical [2,4,7,11,14] calculations. As far as our knowledge goes, this combination of components of the complex electron-atom optical potential, used in our work, has not been applied to calculate the e-Ca elastic scattering characteristics in small steps of scattering angles and incident energies nor does detailed analysis of the CM of the DCSs exist.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Elastic scattering of electrons by calcium atoms

et al. 2014

View full text Add to dashboard Cite

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]

show abstract

Section: Spin Polarizationsupporting

confidence: 78%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Elastic scattering of electrons by calcium atoms

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The form of the polarization potential, (6), has been successfully used for calculations of elastic cross section of a number of atoms (Kaushik et a1 1983, Khare et a/ , 1985. The same form of the polarization potential as in (6) is used also for the final channel.…”

Section: (5)mentioning

confidence: 99%

Approximation of Periodic Functions of Several Variables by Bilinear Forms

Temlyakov¹

1987

Math. USSR Izv.

View full text Add to dashboard Cite

Differential crms sections are calculated for the electron impact excitation of 1%-2's transitions in helium at incident energies of 100 and 200eV. A distorted wave approximation b used with the effect of target polarization taken into acmunt. The results are compared with the recent experimental data of Sakai e r d and with the recent R-matrix method calculation of Nakazaki er al. The present cross section is in general agreement with the R-matrix calculation. It is found, however, that the present calculation cannot reproduce the very large cross Section obtained by Sakai et al in the forward direction at 200 eV.

show abstract

Recent Developments in the Theory of Fast Positron-Atom Collisions

Joachain

1987

Atomic Physics With Positrons

View full text Add to dashboard Cite

Elastic scattering of electrons and positrons by the Ca atom

Cited by 17 publications

References 22 publications

Elastic scattering of electrons by calcium atoms

Elastic scattering of electrons by calcium atoms

Approximation of Periodic Functions of Several Variables by Bilinear Forms

Recent Developments in the Theory of Fast Positron-Atom Collisions

Contact Info

Product

Resources

About