Asymmetric scattering of polarized electrons from atoms with closed and open shells

Bartsch, Manfred; Geesmann, H; Hanne, G F; Keßler, J.

doi:10.1088/0953-4075/25/7/021

Cited by 39 publications

(31 citation statements)

References 20 publications

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“…Like DeS figures, here, also, all the solid curves correspond to values obtained using the RP and the dashed curves to values obtained using the CP in the Dirac equation. The present results show good agreement with the experimental data of Bartsch et al [16] and also with the MS calculation in the low-energy region (2-4 eV), i.e., before the onset of the inelastic threshold, while beyond this elastic region, our results show less satisfactory agreement with experiment. Further, we observe that the inclusion of the absorption potential in the interaction causes the minima to go deeper and the maxima to peak in general, but this feature is seen more clearly at higher impact energies (see Fig.…”

Section: Liesupporting

confidence: 88%

“…n I m r r (16) where Z is the nuclear charge of the target atom. e p is the projectile charge and N n1m is the occupancy number of the orbit (n, l.m).…”

Section: Liementioning

confidence: 99%

“…Recently, Bartsch et al [16] have examined in detail the role of different spin-dependent interactions.…”

mentioning

confidence: 99%

“…Recently, Bartsch et al [16] have reported experimental measurements on asymmetry functions for the elastic scattering of polarized electrons from zinc, cadmium, and indium atoms at low energy. In Sec.…”

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confidence: 99%

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Spin-polarization parameters and cross sections for electron scattering from zinc and lead atoms

et al. 1994

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A relativistic approach is employed to compute the differential and integrated cross sections, spin. polarization P, and the spin-polarization parameters T and U for the scattering of electrons from zinc and lead atoms in the energy range 2.0-200 eVe The projectile-target interaction is represented both by real and complex optical potentials in the solution of the Dirac equation for scattered electrons. We compare our results for spin-polarization P with recent experiment and available theoretical calculations. PACS numberts): 34.80. Bm, 34.80.Nz I. INTRODUCfION It is well known that for the elastic scattering of slow unpolarized electrons from heavier atoms, spin-orbit effects can produce detectable changes in the spin polarization of the scattered electrons. This process is often referred to as Mott scattering. Recent progress both in measurement techniques and in the availability of efficient sources of polarized electrons has led to considerable interest in such experiments. It is now possible to perform experiments in which a complete set of spinpolarization parameters can be measured. Such measurements thus provide direct information about spin-orbit (I·s) interaction, a weak interaction which is generally masked by the much stronger Coulomb interaction. The measurements of all the polarization parameters in electron -heavy-atom collision from low to In addition to the pure spin-orbit interaction effect, polarization of the scattered electron can also occur due to the interplay between the spin-orbit splitting of atomic fine-structure states, referred to as fine-structure effects.In elastic scattering from a closed-shell configuration, only Mott scattering need be considered, but for openshell systems, the fine-structure effect also becomes important. Recently, Bartsch et al. [16] have examined in detail the role of different spin-dependent interactions. McEachran and Stauffer [9] and Nahar and Wadhera [11] both solved the relativistic form of the Schrodinger equation. In the former case, the static and relativistic potentials for atoms were obtained from relativistic Hartree-Fock wave functions; the polarization potentials from a nonrelativistic polarized orbital method and exchange were included exactly through the large component of the scattered wave function, while in the latter case the projectile-target interaction V (r) is represented by both a real and a complex model potential. The real part of the interaction accounts only for the pure elastic scattering and is used to calculate the elastic-scattering cross sections and spin-polarization parameters. Further, these scattering parameters, along with total ..scattering cross sections can also be obtained using the complex model potential. In this case, a model absorption potential Vabs(r) is taken as the imaginary part of a total interaction that includes both elastic-and inelasticscattering processes.Following Nahar and Wadehra [11], we have calculated spin-polarization parameters, differential cross sections (DeS), and integrated elastic,...

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Section: Liesupporting

confidence: 88%

“…n I m r r (16) where Z is the nuclear charge of the target atom. e p is the projectile charge and N n1m is the occupancy number of the orbit (n, l.m).…”

Section: Liementioning

confidence: 99%

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Spin-polarization parameters and cross sections for electron scattering from zinc and lead atoms

et al. 1994

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“…Recent measurements [2][3] of the polarization of scattered electrons have prompted many workers to carry out detailed calculation of these processes. In the elastic scattering of symmetric s-orbit configuration, the polarization effects are caused by spin-orbit interaction of the scattered electron in the atomic field, referred as Mott scattering [4].…”

Section: Introductionmentioning

confidence: 99%

Spin polarization and cross sections of electrons elastically scattered from heavy alkaline-earth atoms

Kumar

Jain

Tripathi

et al. 1994

Z Phys D - Atoms, Molecules and Clusters

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Abstract. Semi-relativistic approach is employed to compute the differential and integrated cross sections, spin polarization P and the spin polarization parameters T and U for the scattering of electrons from barium and strontium atoms in the energy range from 2.0-300 eV. The projectile-target interaction is represented both by real and complex optical potential in the solution of Dirac equation for the scattered electrons. The real optical potential includes the static, a parameter free correlation polarization and a modified semi classical exchange potentials. The complex optical potential is constructed by adding a model absorption potential as its imaginary part to the real optical potential

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Thermal Energy Molecular Beam Sources

Pauly¹

2000

Springer Series on Atomic, Optical, and Plasma Physics

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Asymmetric scattering of polarized electrons from atoms with closed and open shells

Cited by 39 publications

References 20 publications

Spin-polarization parameters and cross sections for electron scattering from zinc and lead atoms

Spin-polarization parameters and cross sections for electron scattering from zinc and lead atoms

Spin polarization and cross sections of electrons elastically scattered from heavy alkaline-earth atoms

Thermal Energy Molecular Beam Sources

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