Electronic resonances in the photofield emission spectra from Ta(1 1 1)

Ha̧dzel, P.; Jurczyszyn, L.; Radoń, T.

doi:10.1016/j.apsusc.2003.08.021

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…By this means it is possible to change the thickness of the apex microcrystal and to observe the change of the maxima spacing. This anticipation has been proved and confirmed for the tantalum field emitter [19]. For the small tip radius r, otherwise for the great geometrical coefficient β (β ≈ 1/r), we observe four maxima (β = 9975 cm −1 ) and for the smaller β, after heating the tip at high temperature, we observe eight maxima (β = 5474 cm −1 ), see Fig.…”

Section: Discussionmentioning

confidence: 63%

“…This means, that the grain boundary between the two microcrystals is displaced from the top of the tip, and the thickness of the emitting microcrystal is greater now. Moreover, it has appeared that polarization of the light beam does not change the apparent frequency of the photocurrent oscillations, and the general shapes of two curves reflect different band structures of bulk metal and that of the metal surface, but the small maxima remain practically unchanged [19].…”

Section: Discussionmentioning

confidence: 99%

“…* corresponding author; e-mail: radon@ifd.uni.wroc.pl An attempt to approach the explanation was made for a tungsten field emitter [18] and confirmed by the results obtained for a tantalum field emitter [19]. All the results containing such photocurrent oscillations are reviewed taking into consideration the new interpretation.…”

Section: Introductionmentioning

confidence: 99%

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Size Effect in Photofield Emission

Radoń

2010

Acta Phys. Pol. A

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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.

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Section: Discussionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

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Size Effect in Photofield Emission

Radoń

2010

Acta Phys. Pol. A

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Sensitive fast electron spectrometer in adjustable triode configuration with pulsed tunable laser for research on photo-induced field emission cathodes

Mingels

Porshyn

Bornmann

et al. 2015

Review of Scientific Instruments

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We have completed an ultra-high vacuum system for sensitive fast electron spectroscopy from cold cathodes in triode configuration under high electric fields E (<100 MV/m) and pulsed tunable laser illumination (3.5 ns, 10 Hz, hν = 0.5-5.9 eV, and 0.3-17 mJ). The cathodes are prepared and inserted under clean room conditions and can be precisely 3D-positioned, cooled or heated (77-400 K). Commissioning results with the upgraded system are presented. Field emission measurements with a W tip yielded an energy resolution of 14 meV at 4 eV pass energy and a precise determination of the emitter work function, size, and temperature. Photoemission spectroscopy of short electron bunches from a virgin and laser-ablated S-GaP crystal and quantum efficiency measurements revealed surface states, energy relaxation, and band structure effects. In conclusion, this novel system is ready now for the development and characterization of photo-induced field emission cathodes.

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Electronic resonances in the photofield emission spectra from Ta(1 1 1)

Cited by 2 publications

References 12 publications

Size Effect in Photofield Emission

Size Effect in Photofield Emission

Sensitive fast electron spectrometer in adjustable triode configuration with pulsed tunable laser for research on photo-induced field emission cathodes

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