Spin asymmetries in elastic and inelastic scattering from rubidium

Guinea, William Edward; Hanne, G. Friedrich; Went, Michael; Daniell, Matthew Lennard; Stevenson, Mark A.; Bartschat, Klaus; Payne, Daniel; MacGillivray, W. R.; Lohmann, Birgit

doi:10.1088/0953-4075/38/18/007

Cited by 7 publications

(8 citation statements)

References 24 publications

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“…Spin-asymmetry function A 2 for electron-impact excitation of the (5s) 2 P 1/2 → (5p) 2 P 1/2,3/2 transitions in Rb at an incident electron energy of 20 eV. The BP37 results for the individual fine-structure levels are shown in comparison to those obtained if the fine-structure is not resolved, as is the case in the measurements of Went et al [20] and Guinea et al [9]. a shift in the zero crossing between our results and the experimental data.…”

Section: Resultsmentioning

confidence: 80%

“…The principal purpose of the present study was to provide theoretical support to an ongoing study in the Brisbane group. Most of our results, for elastic and inelastic electron scattering from Rb atoms for incident energies between 15 eV and 80 eV, will therefore be presented in a joint paper by Guinea et al [9]. Here, we only pick one collision energy (20 eV) and the inelastic 5s → 5p transition to illustrate the sensitivity of various predicted observables to the details of the computational model.…”

Section: Introductionmentioning

confidence: 99%

“…Although this information is also given by Guinea et al [9], we will briefly summarize the most important aspects of the numerical calculation below and thus make the present manuscript self-contained. That section is followed by selected results, concentrating on the discussion of channel coupling and relativistic effects on the angle-differential cross section (DCS), the (pseudo-) Stokes parameters P 1 , P 2 , P 3 , and the asymmetry function A 2 .…”

Section: Introductionmentioning

confidence: 99%

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Channel coupling and relativistic effects in electron-impact excitation of rubidium

Payne¹,

Krueger²,

Bartschat³

2005

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

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Electron-impact excitation of the 5s → 5p resonance transition in rubidium is investigated using a semi-relativistic Breit–Pauli R-matrix with pseudo-states (close-coupling) approach. For the example of 20 eV incident energy, we illustrate the importance of channel coupling and relativistic effects in the computational model. Similar to the case of e–Cs collisions discussed by Andersen and Bartschat (2002 J. Phys. B: At. Mol. Opt. Phys. 35 4507), relativistic effects exhibit themselves only on selected parameters, such as the spin-asymmetry function for the scattering of a spin-polarized electron beam from an unpolarized target beam, while they are almost invisible in the (pseudo-) Stokes parameters that can be measured either in an electron–photon coincidence setup or via ‘time-reversed’ superelastic collisions. The overall agreement with the available experimental data is satisfactory.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Channel coupling and relativistic effects in electron-impact excitation of rubidium

Payne¹,

Krueger²,

Bartschat³

2005

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

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“…Two theoretical approaches are presented here: a semi-relativistic Breit-Pauli R-matrix approach, with and without pseudostates, and a fully relativistic Dirac-Fock calculation. The first approach is a calculation by Bartschat; for details see Guinea et al [8]. The second is that of Stauffer [9].…”

Section: Resultsmentioning

confidence: 99%

Spin-Resolved Collisions of Electrons with Rubidium Atoms: A Search for Relativistic Effects

Guinea¹,

Hanne²,

Went³

et al. 2006

AIP Conference Proceedings

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Abstract. The search for relativistic effects in electron-alkali scattering is currently a topic of considerable interest. The A 2 spin asymmetry parameter is a direct measure of relativistic effects in the electron-atom collision process, as it is entirely dependent on the spin-orbit effect. We present measurements of the A 2 spin asymmetry for the 5S → 5P transition in rubidium at incident energies of 15, 20, 30 and 50 eV and for elastic scattering at 15, 20, 30, 50 and 80eV. Our results indicate that under these collision conditions, relativistic effects are measurable, in qualitative agreement with the available theory.

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“…Corresponding Distorted-Wave Born Approximation (DWBA) results were calculated originally by Pangatiwar and Srivastava [5], later updated by Saxena and Srivastava [6], and results from an even later Relativistic Distorted-Wave (RDW) approximation calculation from Zeman et al [7] are also noted. Superelastic electron scattering from the resonance line has also been investigated by Hall et al [8], while asymmetries in the scattering of spin-polarized electrons from Rb were studied by Guinea et al [9]. A theoretical analysis of channel coupling and relativistic effects in the excitation of the Rb resonance line by Payne et al [10], using a Breit-Pauli (BP) R-matrix (close-coupling) method, has also been reported.…”

Section: Introductionmentioning

confidence: 99%

Electron-impact excitation of the 5$$\varvec{^2\textbf{S}_{1/2} \rightarrow 5^2\textbf{P}_{1/2}}$$ and 5$$\varvec{^2\textbf{P}_{3/2}}$$ transitions in rubidium by 40 eV electrons: theory and experiment

et al. 2022

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We report on a series of detailed Breit-Pauli and Dirac B-spline R-matrix (DBSR) differential cross section (DCS) calculations for excitation of the $$5\,^2\mathrm{S}_{1/2} \rightarrow 5\,^2\mathrm{P}_{1/2}$$ 5 2 S 1 / 2 → 5 2 P 1 / 2 and $$5\,^2\mathrm{S}_{1/2}\rightarrow 5\,^2\mathrm{P}_{3/2}$$ 5 2 S 1 / 2 → 5 2 P 3 / 2 states in rubidium by 40 eV incident electrons. The early BP computations shown here were carried out with both 5 states and 12 states, while the DBSR models coupled 150 and 325 states, respectively. We also report corresponding results from a limited set of DCS measurements on the unresolved $$5\,^2\mathrm{P}_{1/2,3/2}$$ 5 2 P 1 / 2 , 3 / 2 states, with the experimental data being restricted to the scattered electron angular range 2–$$10^\circ $$ 10 ∘ . Typically, good agreement is found between our calculated and measured DCS for excitation of the unresolved $$5\,^2\mathrm{P}_{1/2,3/2}$$ 5 2 P 1 / 2 , 3 / 2 states, with best accord being found between the DBSR predictions and the measured data. The present theoretical and experimental results are also compared with predictions from earlier 40 eV calculations using the nonrelativistic Distorted-Wave Born Approximation and a Relativistic Distorted-Wave model. Graphic abstract

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Spin asymmetries in elastic and inelastic scattering from rubidium

Cited by 7 publications

References 24 publications

Channel coupling and relativistic effects in electron-impact excitation of rubidium

Channel coupling and relativistic effects in electron-impact excitation of rubidium

Spin-Resolved Collisions of Electrons with Rubidium Atoms: A Search for Relativistic Effects

Electron-impact excitation of the 5$$\varvec{^2\textbf{S}_{1/2} \rightarrow 5^2\textbf{P}_{1/2}}$$ and 5$$\varvec{^2\textbf{P}_{3/2}}$$ transitions in rubidium by 40 eV electrons: theory and experiment

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