Accession Number : AD0613310

Title :   INTERACTIONS OF ATOMS AND MOLECULES WITH SOLID SURFACES.

Descriptive Note : Annual and status rept. for 1 Apr-30 Sep 64,

Corporate Author : SYRACUSE UNIV RESEARCH INST N Y

Personal Author(s) : Trischka,John W.

Report Date : 30 SEP 1964

Pagination or Media Count : 6

Abstract : 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)

Descriptors :   (*PLATINUM ALLOYS, SURFACE PROPERTIES), (*TUNGSTEN ALLOYS, SURFACE PROPERTIES), (*THERMIONIC EMISSION, MEASUREMENT), WIRE, ELECTRONS, IONS, POTASSIUM COMPOUNDS, CHLORIDES, VACUUM APPARATUS, CALCIUM, ATOMIC BEAMS, MOLECULAR BEAMS

Distribution Statement : APPROVED FOR PUBLIC RELEASE