Quantum Interference In Clothed-ion-atom Binary Peak Structures

An impulse approximation for ionizing collisions of clothed ions with atoms is used to explain the origin of an anomalous oscillation in the ejected electron spectrum in the region of the binary peak. In addition, measurements which evidence this feature for 1-MeV/u U21+ ions colliding with helium are presented. It is shown that this behavior arises from interference structures in the elastic differential cross section for the scattering of target electrons from the impinging ion and that it is associated with the well-known phenomenon of rainbow scattering. © 1991 The American Physical Society

Quasi-discretization Of The Electron Continuum Emitted In Collisions Of 0.6 Mev U−¹ Au11+ With Noble Gases

We have measured relative doubly differential cross sections for electron emission in collisions of 0.6 MeV u−1 Au11+ projectile ions with He, Ne and Ar targets for laboratory electron-detection angles between 17\u27 and 80\u27 and electron energies from 100 eV to well above the classical binary encounter region. The authors observe that, independent of the target Zt, the electron spectra display three characteristic peak-line structures whose energies are nearly invariant with observation angle. These structures are attributed to the diffraction of quasi-free target electrons in the potential of the projectile. © 1992 IOP Publishing Ltd

L-SUBSHELL IONIZATION PROBALITIES IN FAST ASYMMETRIC ION-ATOM COLLISIONS

It has been established that K-shell ionization probabilities in very asymmetric fast ion-atom collisions can be described well by first order perturbation theory. For the L-substates, however, impact parameter dependent ionization probabilities show severe discrepancies with these theoretical approaches. From the L-subshell ionization probabilities, the measured impact parameter dependent L111 - alignment and δ-electron emission probabilities we can deduce that the dynamical behaviour of the electron wave function during the collision has a strong influence on the measured transition probabilities

Observation Of Structures In The Binary Encounter Peak In Fast Uranium-rare Gas Collisions

For 1.4 MeV/u U33+ on rare gas atoms, the double differential cross sections Δ2σ(Ee, θ{symbol}e) ΔEeΔωe as a function of the electron emission energy Ee at different emission angles θ{symbol}e were measured. At θ{symbol}e≈40° an unexpected structure in the center of the binar encounter peak was observed, which varies strongly with the electron emission angle. © 1989

Multiple Ionization And Collision Dynamics In High-energy Uranium-rare Gas Collisions

The multiple ionization of rare gas target atoms in collisions with MeV/u highly-charged heavy ions was investigated systematically in a projectile energy (Ep) regime between 1.4 and 420 MeV/u. The absolute cross sections σ(q) for the production of Ar recoil-ions with charge state q decrease smoothly with (Ep) for q ≤ 8, whereas a distinct maximum in the Ep-dependence can be observed for higher q. Furthermore, for 1.4 MeV/u U32+ and 5.9 MeV/u U65+ impact on Ne, a new experimental technique was applied allowing the simultaneous determination of q and of the transverse (with respect to the beam axis) recoil-ion momentum pR⊥. From the good agreement of these differential absolute cross sections with the results of n-body classical trajectory Monte Carlo (nCTMC) calculations we conclude that the trajectories of the heavy nuclei are influenced considerably by the interaction with the target electrons as has been predicted by theory. © 1989

Beobachtung quantenmechanischer Interferenzstrukturen in den Energiespektren von atomaren Delta-Elektronen in Uran-Edelgas Stoessen

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