Formation of positive and negative ions on rhenium, oxygenated tungsten, hafnium, lanthanum hexaboride, and thoriated tungsten surfaces

Avigdor Persky, Edward F. Greene, Aeon Kuppermann

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40 Scopus citations

Abstract

Yields are reported for the formation of positive and negative ions from molecular beams striking various surfaces. Negative ions are formed from beams of several halogen compounds and tetracynoethylene on Re, Hf, thoriated W, and LaB6 with efficiencies ranging up to a maximum of 2.6 10-2 for KClon thoriated W (activated). This filament may be useful in detectors for some molecular-beam studies. The efficiencies for the formation of positive ions from K and potassium halides are generally in agreement with the SahaLangmuir model. They are near unity on oxygenated W, Re, and thoriated W (deactivated by heating to deplete the thorium) but much lower (2.5-6.6×10-3) on thoriated tungsten (activated).

Original languageEnglish
Pages (from-to)2339-2344
Number of pages6
JournalJournal of Chemical Physics
Volume49
Issue number5
DOIs
StatePublished - 1968
Externally publishedYes

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