Showing papers by "Francis Delannay published in 1977"
01 Jan 1977
Abstract: Assuming long range charge exchange mechanisms and neglecting shadowing effects, theory predicts the variation of the scattered ion yield with the scattering angle thetas and the incidence angle psi for some well defined experimental conditions. Such measurements were performed for /sup 4/He/sup +/ scattering on polycrystalline copper at incident energies ranging from 0.5 to 1.25 keV and at scattering angles from 20 degrees to 130 degrees . It is suggested that shadowing effects should be taken into account in order to explain the observed behaviour.
16 citations
TL;DR: In this article, the variation of the scattered ion yield with the scattering angle thetas and the incidence angle psi for some well defined experimental conditions is predicted for polycrystalline copper at incident energies ranging from 0.5 to 1.25 keV and at scattering angles from 20 degrees to 130 degrees.
16 citations
TL;DR: In this article, a high-resolution energy analyser of the spherical condenser type with variable predeceleration is described, and the optimization of the resolution over a broad energy band while maintaining total transmission is discussed.
Abstract: A high-resolution energy analyser of the spherical condenser type with variable predeceleration is described. The optimization of the resolution over a broad energy band while maintaining total transmission is discussed. Furthermore, following the study of the properties of a twin-tube lens, a decelerating system is proposed which makes use of only three lenses polarized by means of voltage dividers. Measurements of the performances of such an ion spectrometer for surface analysis are presented.
11 citations
TL;DR: In this paper, the variation of scattering yields with incident energy and scattering angle for He/sup +/ ions incident on Bi surfaces and are interpreted in terms of a combination of a short-range quasiresonant and a long-range Auger type neutralization process.
Abstract: Measurements are reported for the variation of scattering yields with incident energy and scattering angle for He/sup +/ ions incident on Bi surfaces and are interpreted in terms of a combination of a short-range quasiresonant and a long-range Auger type neutralization process.