Dynamic behavior of thermionic dispenser cathodes under ion bombardment

We have investigated the surface coverage and electron emission of thermionic dispenser cathodes during 3 keV Ar+ ion bombardment, thereby simulating the bombardment of the cathodes by residual gases that takes place in cathode-ray tubes as used in television sets. During the ion bombardment at the...

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Veröffentlicht in:Journal of applied physics 2001-04, Vol.89 (8), p.4354-4364
Hauptverfasser: Cortenraad, R., van der Gon, A. W. Denier, Brongersma, H. H., Gärtner, G., Raasch, D., Manenschijn, A.
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container_end_page 4364
container_issue 8
container_start_page 4354
container_title Journal of applied physics
container_volume 89
creator Cortenraad, R.
van der Gon, A. W. Denier
Brongersma, H. H.
Gärtner, G.
Raasch, D.
Manenschijn, A.
description We have investigated the surface coverage and electron emission of thermionic dispenser cathodes during 3 keV Ar+ ion bombardment, thereby simulating the bombardment of the cathodes by residual gases that takes place in cathode-ray tubes as used in television sets. During the ion bombardment at the operating temperature of 1030 °C, a dynamic equilibrium is established between the sputter removal and resupply mechanisms of the Ba and O atoms that form the dipole layer on the cathode substrate. We demonstrated that the performance of the cathodes under ion bombardment is governed by the O removal and resupply rates. It was found that the Ba resupply rate is almost an order of magnitude higher than the O resupply rate, but that the Ba can only be present on the surface bound to O atoms. Therefore, the Ba/O ratio is approximately equal to unity during the ion bombardment. Based on the investigations of the removal and resupply processes, we proposed a model that accurately describes the surface coverage and electron emission during the ion bombardment, including the dependence of the ion flux and cathode temperature.
doi_str_mv 10.1063/1.1356433
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title Dynamic behavior of thermionic dispenser cathodes under ion bombardment
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