Accession Number : AD0666243

Title :   ENERGY SPECTRA OF SLOW IONS EMITTED BY A METAL SURFACE AS A RESULT OF ION BOMBARDMENT,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Arifov,U. A. ; Gruich,D. D.

Report Date : 07 AUG 1967

Pagination or Media Count : 11

Abstract : Energy spectra of slow Cs(+) ions emerging from pure cold and hot Ni(-), Mo(-), and W(-) targets were studied by means of a 127 degree cylindrical capacitor with a resolution delta E = 0.5 eV. The secondary ions were analyzed at an angle of 135 degrees with respect to the direction of the primary Cs(+) ions which fell on the target normally. Thermionic-emission and slow-ion peaks are resolved in the spectra. The slow-ion spectrum width is independent of the target temperature; however, it increases in the same order as the atom bond energies in the Ni(-), Mo(-), and W(-) targets. With the experimental spectra plotted in semilogarithmic scale, their right-of-maximum branches well register with the straight lines whose slopes are in the same order. This permits presuming that the slow ions acquire their energy from intense oscillation of atoms in that target section which is excited by the ion bombardment. (Author)

Descriptors :   (*ION BOMBARDMENT, REFRACTORY METALS), (*THERMIONIC EMISSION, MEASUREMENT), CESIUM, ENERGY, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA, NICKEL, MOLYBDENUM, TUNGSTEN, PARTICLE ACCELERATOR TARGETS, SECONDARY EMISSION, TARGET ANGLE, TEMPERATURE, ATOMS, OSCILLATION, CAPACITORS, RESOLUTION, SPECTROMETERS, USSR

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE