Measurement of spin-exchange effects in electron-hydrogen collisions: Further studies of impact ionization

Fletcher, G. D.; Alguard, M. J.; Hughes, V. W.; Wainwright, P. F.; Lubell, M. S.

doi:10.1103/physreva.26.3664

Cited by 28 publications

(4 citation statements)

References 13 publications

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“…[2], Fletcher et al [3], Gay et al. [4], and Fletcher et al [5]) have been on 90' elastic scattering from 4.4 to 30.3 eV. While most of the predictions for the spin-averaged elastic differential cross section at 90 agree with each other and with the measurements of Williams [6] and Callaway and Williams [7], as seen in Fig.…”

Section: Introductionsupporting

confidence: 57%

15-stateR-matrix investigation of resonances in elastic scattering of electrons from atomic hydrogen at low energies

1993

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A 15-state R-matrix calculation has been carried out at 685 energies ranging from 1 -17 eV to depict the resonant profiles for the elastic differential cross sections and the angular distribution of the spin asymmetry A &, i, (O, k ) in the elastic scattering of spin-polarized electrons by spin-polarized hydrogen atoms at angles of 30', 55', 70', and 90'. The calculations are compared with experiments. PACS number(s): 34.80.8m, 34.80.Nz

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Section: Introductionsupporting

confidence: 57%

15-stateR-matrix investigation of resonances in elastic scattering of electrons from atomic hydrogen at low energies

1993

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“…which has never been investigated in previous theoretical study [95][96][97][98][99][100] or experiments [101][102][103][104]. But this term may contribute even smaller fractions to total cross-section, since the sum of all spin-dependent terms have attributed just minor fraction in total cross-section.…”

Section: The Conservation Law For the Scale-invariant Interactionmentioning

confidence: 89%

Scaling Transformation for Nonlocal Interactions

Wang

2015

JMP

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In the light of their relationships with renormalization, in this paper we associate the scaling transformation with nonlocal interactions. On one hand, the association leads us to interpret the nonlocality with locally symmetric method. On the other hand, we find that the nonlocal interaction between hadrons could be test ground for scaling transformation if ascribing the running effects in renormalization to scaling transformation. First we derive directly from group theory the operator/coordinate representation and unitary/spinor representation for scaling transformation, then link them together by inquiring a scaling-invariant interaction vertex mimicking the similar process of Lorentz transformation applied to Dirac equation. The main feature of this paper is that we discuss both the representations in a sole physical frame. The representations correspond respectively to the spatial freedom and the intrinsic freedom of the same quantum system. And the latter is recognized to contribute to spin angular momentum that in literature has never been considered seriously. The nonlocal interaction Lagrangian turns out to vary under scaling transformation, analogous to running cases in renormalization. And the total Lagrangian becomes scale invariant only under some extreme conditions. The conservation law of this extreme Lagrangian is discussed and a contribution named scalum appears to the spin angular momentum. Finally a mechanism is designed to test the scaling effect on nonlocal interaction.Comment: 17 pages, 3 figure

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“…The spin asymmetry measurements in the total ionization cross section have been carried out for hydrogen and some alkali metals by Alguard et al [3], Gay et al [4], Baum et al [5], Fletcher et al [6], Crowe et al [7] and Guo et al [8]. Recently Frost et al [9] and Baum et al [10,11] carried out TDCS measurements with polarized electrons on polarized lithium at 54.4 eV incident energy.…”

Section: Introductionmentioning

confidence: 98%

Spin asymmetry in near threshold (e, 2e) process for lithium and hydrogen

Gupta

Srivastava

1996

Z Phys D - Atoms, Molecules and Clusters

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The singlet and triplet cross sections and the asymmetry parameter for e-H and e-Li ionization have been calculated in a distorted-wave Born approximation for incident energies in the range 0.5 to 20 eV above the ionization threshold. The two final-state continuum electrons are assumed to share equal energy and to come out 180°apart. The variation with respect to the angle of scattering is found to be qualitatively very different in the two cases. It is found that, in the case of lithium, the D and F components in the scattering amplitude are quite significant even at very low energies.

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Measurement of spin-exchange effects in electron-hydrogen collisions: Further studies of impact ionization

Cited by 28 publications

References 13 publications

15-stateR-matrix investigation of resonances in elastic scattering of electrons from atomic hydrogen at low energies

15-stateR-matrix investigation of resonances in elastic scattering of electrons from atomic hydrogen at low energies

Scaling Transformation for Nonlocal Interactions

Spin asymmetry in near threshold (e, 2e) process for lithium and hydrogen

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