Application of WFS for simultaneous work function and secondary electron emission measurement on Ba covered tungsten

György Vida, Ildikó Beck, K. Josepovits, Miklós Györ

Research output: Contribution to journalArticle

Abstract

In the present paper the secondary emission and work function of W covered with different thickness Ba layers are compared. The secondary emission and work function were measured by Work Function Spectroscopy (WFS). It is clearly pointed out that the thin Ba coating causes the the enhancement of electron induced secondary electron emission. In high pressure discharge lamps high secondary emission and high thermionic current are required for reliable operating conditions, i.e., for reaching the nominal burning voltage and current etc. The results prove that the Ba spreading on the W surface from an alkali earth tungstate material is advantageous for lowering the work function and, simultaneously, for increasing the secondary emission yield.

Original languageEnglish
Pages (from-to)293-296
Number of pages4
JournalMaterials Science Forum
Volume473-474
Publication statusPublished - 2005

Fingerprint

Secondary emission
Tungsten
Electron emission
secondary emission
electron emission
tungsten
Spectroscopy
spectroscopy
Discharge lamps
Alkalies
tungstates
thermionics
Earth (planet)
luminaires
alkalies
Coatings
Electrons
Electric potential
coatings
augmentation

Keywords

  • Barium
  • Discharge lamps
  • Secondary emission
  • Thermionic emission
  • Tungsten

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Application of WFS for simultaneous work function and secondary electron emission measurement on Ba covered tungsten. / Vida, György; Beck, Ildikó; Josepovits, K.; Györ, Miklós.

In: Materials Science Forum, Vol. 473-474, 2005, p. 293-296.

Research output: Contribution to journalArticle

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AB - In the present paper the secondary emission and work function of W covered with different thickness Ba layers are compared. The secondary emission and work function were measured by Work Function Spectroscopy (WFS). It is clearly pointed out that the thin Ba coating causes the the enhancement of electron induced secondary electron emission. In high pressure discharge lamps high secondary emission and high thermionic current are required for reliable operating conditions, i.e., for reaching the nominal burning voltage and current etc. The results prove that the Ba spreading on the W surface from an alkali earth tungstate material is advantageous for lowering the work function and, simultaneously, for increasing the secondary emission yield.

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