INTERACTIONS OF ATOMS AND MOLECULES WITH SOLID SURFACES.
Annual and status rept. for 1 Apr-30 Sep 64,
SYRACUSE UNIV RESEARCH INST N Y
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A summary is given of work devoted to the study of Pt-W and Pt surfaces by observations of electron thermionic emission and positive ion emission. Wires of both metals show, under certain conditions, the ability to ionize K atoms, but not the K atom bound to a halogen in an alkali halide vapor. This is called a discriminating property. The following work was completed 1 The discriminating property of Pt-W surfaces, as evidenced by changes in electron emission, could be produced under ultra-high vacuum conditions, thereby demonstrating that the property is inherent in the surface and not an effect produced by ambient gas in the vacuum system. 2 The electron emission properties of discriminating and non-discriminating surfaces were compared. 3 A beam of Ca atoms was detected by the use of simultaneous Ca and KC1 molecular beams, impinging on a discriminating Pt-W wire. Author