Coincidence Measurements of Krypton-Krypton Collisions

Abstract

In collisions of Kr + ions with Kr atoms at keV energies, both particles from the same encounter are recorded in coincidence. The charge states m of the scattered particle and n of the recoil particle are measured, and the relative probability of such an (m, n) event is determined, together with the inelastic energy loss associated with that event. These data are analyzed using the statistical model of Everhart and Kessel. This model, which assumes m and n to be statistically independent of each other, fits the data fairly well. Ionization potentials for Kr +5 through Kr +9 are estimated from the data curves as interpreted by the statistical model. There is an active region in the Kr + -Kr data at 25-keV incident energy and 9° scattering where the inelastic energy changes suddenly, and other anomalous effects are found. This is compared and contrasted with active regions previously found in Ne + -Ne and Ar + -Ar data.

Measurements of Inelastic Energy Loss in Atomic Collisions ofAl+,P+Fastrup1, Hermann2, Smith3 1971Phys. Rev. A93090View full textAdd to dashboardCite

“…The recoil-energy spectra are more ambiguous to resolve, and an example of this is shown in Fig. 4 (2) or (3), the energies of the scattered or recoil particles are transformed into inelastic energy loss Q, and hence Z& is converted into g&. The "area" of peak j, representing all scattered particles with charge state m and energy loss Q&, is denoted by V~".…”

“…By means of Eq. (1) and momentum conservation in the collision, we obtain Q = 2y(EOE, )'~' cos8+ (1y)EO -(1+ y)E" (2) where y= M, /M& is the mass ratio between the incident particle and the target particle, and 8 is the scattering angle of the scattered incident particles. For the recoil-particle method, the corresponding equation is…”