Accession Number : AD0717063

Title :   Interaction of Gaseous Ions with a Metal Surface,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Fillippov,B. V.

Report Date : 28 OCT 1970

Pagination or Media Count : 19

Abstract : For collision of an ion with a metal surface, with reference to aerodynamic applications, the report examines the general problem of the physical mechanisms of the accompanying processes and the specific problem of the charge states of the gas particle and surface. The semi-empiric Hagstrum theory is discussed with correction of its internal contradictions. It is considered firmly established that ion neutralization by given metallic surfaces corresponds to the mechanism of Auger neutralization. The theory discussed permits calculation of aerodynamic values with good accuracy. It is found that practically all positive ions that collide with a pure metallic surface are neutralized. Secondary electrons must be taken into account in calculation of the charge state. A considerable part of the energy of ion neutralization and the energy of strongly excited atoms is converted to thermal energy, which can exceed ion kinetic energy at a velocity of about 8 km/sec. (Author)

Descriptors :   (*METALS, ION BOMBARDMENT), IONIZATION, NEUTRALIZATION, ELECTRON TRANSITIONS, MOLECULAR ENERGY LEVELS, EXCITATION, WORK FUNCTIONS, USSR

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE