Further observations on the operation of a GaAs polarized electron source

Guo, X.; Crowe, D. M.; Lubell, M. S.; Tang, Feng; Vasilakis, A.; Eminyan, M.; Slevin, J

doi:10.1063/1.1141108

Cited by 12 publications

(2 citation statements)

References 19 publications

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“…The source has an emission current of up to 300 p A and polarizations that are typically 26-27 %, as measured by the Mott polarimeter. We estimate the energy resolution of the electron beam to be about 150 meV, comparable to that of similar sources [18]. With the photocathode at -2000 V, a ''stiff' beam is provided for transport through the various valves and the Mott polarimeter before entering the target chamber.…”

Section: B Electron Source and Mott Polarimetermentioning

confidence: 91%

Investigation of spin-orbit effects in the excitation of noble gases by spin-polarized electrons

1993

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We have measured the integrated Stokes parameters of the light emitted following the impact excitation by polarized electrons of the np 5 (n+1)p [5/2] We have measured the integrated Stokes parameters of the light emitted following the impact excitation by polarized electrons of the np5 ( n + l)p [5/213 states in Ne (n =2), Ar (n =3), Kr ( n =4), Xe (n = 5 ) , and the np5 (n + 1 )p [5/212 state in Kr. The near-threshold linear-polarization fractions 7, were consistent with zero for all of the J = 3 states measured, providing no evidence of Mott scattering. For J = 2 excitation, 7 , shows the clear influence of the intermediately coupled nature of the state. At threshold, the measured circular polarization 77, and linear polarization 7, for the J =3 states agree well with the LS-coupled threshold predictions. These results provide the basis for optical measurements of electron polarization.

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Section: B Electron Source and Mott Polarimetermentioning

confidence: 91%

Investigation of spin-orbit effects in the excitation of noble gases by spin-polarized electrons

1993

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“…We determined the energy spread of the electron beam in separate measurements (Guo et al 1990) of the atomic ionisation rate (hydrogen source RF turned on) between 13.67 and 13.87 eV. Assuming a Gaussian energy distribution (which is only approximately correct), we generated a set of convoluted cross section curves based upon the Wannier power law (Wannier 1953) and various Gaussian widths.…”

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confidence: 99%

Spin-tagged electron-hydrogen scattering: New measurements of ionisation asymmetries from threshold to 500 eV

Crowe

Guo

Lubell

et al. 1990

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

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Using beams of polarised electrons and polarised hydrogen atoms we measured the spin antiparallel-parallel ionisation asymmetry from threshold to 500 eV. Our measurements are generally more precise than those of earlier studies and, more significantly, are characterised by an energy spread that is at least an order of magnitude smaller than that of the earlier work. We compare our results with several theoretical models as well as with the results from similar experiments using polarised alkali atoms.

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Optimizing Motion‐Induced Spin Transfer

Oue,

Matsuo

2024

Physica Status Solidi (b)

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In this article, the spin transfer between two ferromagnetic insulators is studied. There is a narrow gap between the ferromagnetic insulators so that they are weakly interacting with each other. One of the ferromagnetic insulators is moving at a constant speed while the other is at rest; hence, the system is out of equilibrium. In the presence of the shearing motion, the interaction amplitude is periodically modulated at the Doppler frequency. A unitary transformation allows us to regard the periodic modulation of the interaction amplitude as an effective potential, which drives the spin transfer. The amount of the spin current is controlled by the spectral overlap and the carrier population difference between the two ferromagnetic media. If the spectra of the two ferromagnets are moderately broadened, the overlap in the spectral domain increases, enlarging the spin current. However, too much broadening spoils the spectral overlap and, hence, the spin current. This implies that there is an optimal condition for maximizing the spin transfer.

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Further observations on the operation of a GaAs polarized electron source

Cited by 12 publications

References 19 publications

Investigation of spin-orbit effects in the excitation of noble gases by spin-polarized electrons

Investigation of spin-orbit effects in the excitation of noble gases by spin-polarized electrons

Spin-tagged electron-hydrogen scattering: New measurements of ionisation asymmetries from threshold to 500 eV

Optimizing Motion‐Induced Spin Transfer

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