Investigation of electron emission properties of Ba-activated tungsten cathodes

I. Beck, K. Josepovits, J. Sneider, Z. Toth

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In this work we investigated the electron emission properties of high-pressure discharge lamp cathode tips. The work function (Φ) of the cathode tip was measured by using the Kelvin probe method and by work function spectroscopy (WFS). The Kelvin probe method was used to measure the average work function of tips under atmospheric pressure in air. By WFS we could measure the local work function value of tips in the selected spots under ultra high vacuum conditions. The chemical composition analysis was carried out in the same chamber by Auger electron spectroscopy. The focus of this study is to investigate the influence of sintering temperature of cathodes (1500-1700 °C) and lamp operation time (0-12 000 h) on the work function. The comparison of the work function of both cathodes as a function of operation time originating from the two different ends of the ceramic tube is also considered. In order to understand the structure of the layers on the cathode tips we also give results obtained on a flat tungsten foil covered with Ba-containing emission material. The flat samples were measured using x-ray photoelectron spectroscopy and WFS.

Original languageEnglish
Pages (from-to)3865-3869
Number of pages5
JournalJournal of Physics D: Applied Physics
Volume38
Issue number21
DOIs
Publication statusPublished - Nov 7 2005

Fingerprint

Tungsten
Electron emission
electron emission
tungsten
Cathodes
cathodes
Spectroscopy
luminaires
spectroscopy
Discharge lamps
Ultrahigh vacuum
Auger electron spectroscopy
Photoelectron spectroscopy
Electric lamps
Metal foil
x ray spectroscopy
ultrahigh vacuum
Auger spectroscopy
Atmospheric pressure
electron spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Investigation of electron emission properties of Ba-activated tungsten cathodes. / Beck, I.; Josepovits, K.; Sneider, J.; Toth, Z.

In: Journal of Physics D: Applied Physics, Vol. 38, No. 21, 07.11.2005, p. 3865-3869.

Research output: Contribution to journalArticle

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