Positive Surface Ionization of Na, NaCl, NaBr, NaI, and LiCl on Rhenium and on Oxygenated Rhenium Surfaces

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Abstract
Results are reported for the ionization of sodium,sodium halides, and lithium chloride on rhenium and on oxygenated rheniumsurfaces. The oxidation of a rheniumsurface was found to cause an increase in its work function. As a result the ionization efficiencies for sodium and sodium halides incident on this surface are increased from about 0.20 to unity. The efficiency for lithium chloride is also increased to a value probably close to unity. The oxide layer which is formed even at low air pressures (5 × 10−7 torr) seems to be stable only up to about 1650°K.