Universal Cross Sections forK-Shell Ionization by Heavy Charged Particles. I. Low Particle Velocities

Ion-Induced Auger Electron Processes in Gases

“…Here two different theoretical curves are also indicated. The agreement with the calculation of Basbas et al (1973) is .rather good.…”

Relativistic Heavy-Ion-Atom Collisions

“…(Merzbacher and Lewis 1958, Basbas et al 1973. These theories generally use hydrogenic electron wave functions.…”

“…This distortion reduces the ionization cross -16 -sections at low ion velocities, but increases them at high velocities. At low velocities, the electrons form diatomic molecular orbitals around the projectile and target nuclei, thereby becoming more tightly bound and more difficult to excite, so smaller ionization cross sections are seen (Basbas et al 1973;Anholt and Meyerhof 1977). At high ion velocities, the polarization of the electron clouds decreases the electron-perturbing-nucleus distance, thereby increasing the strength of the perturbing potential, leading to higher ionization cross sections (Basbas et al 1971a(Basbas et al , 1971b(Basbas et al , 1978.…”

“…excitation occurs at small impact parameters where the strong perturbing potential can significantly distort the inner-shell wave functions, giving a nonlinear dependence of the amplitude on Zx (Basbas et al 1973(Basbas et al , 1978.…”

Penetration of heavy ions through matter

“…However, the effect of projectile nuclear charge on ~i (and, therefore, on E B and r K as well) is no longer negligible in the case of heavier projectiles. This influence of projectile nuclear charge was thoroughly examined by Andersen et al (1976) and Schmidt-B~cking et al (1977)., and it may be seen there that, when binding energy corrections are made (Brandt et ai.1973 andBasbas et al 1973), the above scaling law can still lead to a satisfactory description of the experimental values of P(b). The SCA scaling law and its additional and necessary correction terms, owing to the influence of the binding-energy, Coulomb-deflection and relativistic effects, are thoroughly discussed by Laegsgaard et ai.(1977).…”