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Size Effect in Photofield Emission

100%
Radoń T.
|
|
issue 4
596-599
EN
This paper contains a short reconsideration and explanation of the effect of photofield emission-current deviations. Theoretical considerations of the dynamic image-potential barrier did not yield a satisfactory result. A certain interpretation, suggested a few years ago, indicated that the photocurrent deviations reflect quantum-well states of the outer microcrystal of the apex of the field emitter. This point of view covers a variety of photocurrent deviations observed both for the integral field emission and for the one from a single crystal face as well as from a barium covered field emitter. It also includes the deviations observed for different photon energies and the deviations containing different apparent frequencies.
2
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Temperature Dependence of Photofield Emission from Tungsten ⟨001⟩ Direction

63%
Radoń T., Jaskólka S.
Acta Physica Polonica A
|
1996
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vol. 89
|
issue 5-6
665-668
EN
The existence of a minimum lying by 0.2 eV above the Fermi level, in the band structure of the ⟨001⟩ direction of tungsten, has been confirmed at temperatures of 600÷800 K of the emitter. With increasing temperature a slight rise of the Fermi level in relation to the band structure has been observed.
3
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Photofield Emission Spectroscopy of Ba on W

63%
Radoń T., Jaskółka S.
Acta Physica Polonica A
|
1995
|
vol. 87
|
issue 3
657-662
EN
Optical transitions in photofield emission from barium covered tungsten were observed. The initial energies of the excited electrons obtained for dif­ferent crystallographic planes range near the values of s₁ = -0.07 ± 0.02 eV and s₂ = -0.28 ± 0.04 eV with respect to the Fermi level. The energies are ascribed to electrons in the thin barium layer. The work functions of the barium covered tungsten (100), (111) and (100) planes were estimated us­ing field emission method. In order to measure very small photocurrents a modulated laser radiation and the phase-sensitive detection were used.
4
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Residual Gas Effect on Photofield Emission from Tungsten (111) Face

51%
Hądzel P., Radoń T., Jaskółka S.
Acta Physica Polonica A
|
1997
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vol. 91
|
issue 6
1141-1147
EN
Using the photofield emission method, surface states and bulk excitations from clean and residual gas adsorbed (111) face of tungsten were measured. Residual gas shaded the surface states and diminished photoemission from the bulk excitations. Gas of the artificially increased background pressure 10^{-8} Pa adsorbed during the measurement deforms the photocurrent-voltage characteristic; the optical excitations observed for clean surfaces are exhibited, diminished or lost. For the adsorbed (111) face the state related to the metal-gas surface has been observed.
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