A Study of Epithermal Positron Emission from Metallic Surfaces

Goodyear, A.; Knights, Andrew P.; Overton, N.; Coleman, P. G.

doi:10.4028/www.scientific.net/msf.175-178.161

MSF

1994

DOI: 10.4028/www.scientific.net/msf.175-178.161

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A Study of Epithermal Positron Emission from Metallic Surfaces

A. Goodyear¹,

Andrew P. Knights

N. Overton³

et al.

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“…The measurements were performed using the University of East Anglia (UEA) electrostatic beam system [12] shown schematically in beam arm essentially eliminates background counts due to high energy particles which could otherwise reach the target. By reversing the polarity of the potentials applied to the lenses an electron beam, generated by beta-positron-induced secondary electron emission from the moderator mesh, can be obtained.…”

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Measurement of the Energy Spectrum of Secondary Electrons Ejected from Solids by Positron Impact

Overton

Coleman

1997

Phys. Rev. Lett.

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Energy distributions of fast secondary electrons ejected from Cu and Si bombarded by positrons of energies in the range 50 to 2000 eV, incident at glancing angles ͑#5 ± ͒ and at 35 ± , have been fit to the form AE 2m proposed by E. N. Sickafus. The absence of electron backscattering and the reduction of cascade effects common in electron-stimulated secondary electron spectra allow the direct determination of m for comparison with theory. The values obtained rise from 1.5 at 2000 eV to about 2.5 at 50 eV, and are all higher than those found for electrons incident at higher energies (0.5 -1.5). No significant dependence of the value of m on target species or angle of incidence was observed. [S0031-9007(97)03544-8] PACS numbers: 79.20.Hx

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Measurement of the Energy Spectrum of Secondary Electrons Ejected from Solids by Positron Impact

Overton

Coleman

1997

Phys. Rev. Lett.

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Positron diffusion in solids and the reconstruction of inhomogeneous defect distributions from lifetime measurements

Kögel

1996

Appl. Phys. A

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A Study of Epithermal Positron Emission from Metallic Surfaces

Cited by 2 publications

References 0 publications

Measurement of the Energy Spectrum of Secondary Electrons Ejected from Solids by Positron Impact

Measurement of the Energy Spectrum of Secondary Electrons Ejected from Solids by Positron Impact

Positron diffusion in solids and the reconstruction of inhomogeneous defect distributions from lifetime measurements

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