Coherence and Correlation in Atomic Collisions by I. E. McCarthy (auth.), H. Kleinpoppen, J. F. Williams

By I. E. McCarthy (auth.), H. Kleinpoppen, J. F. Williams (eds.)

H. KLEINPOPPEN AND J. F. WILLIAMS It has in basic terms very lately turn into attainable to check angular correlations and coherence results in several components of atomic collision strategies: those investigations have supplied us with an research of experimental information by way of scattering amplitudes and their stages, of objective parameters similar to orientation, alignment, and country multipoles, and in addition of coherence parameters (e. g. , the measure of coherence of excita­ tion). during this method the research of electron-photon, ion-photon, atom-photon, or electron-ion coincidences from electron-atom, ion-atom, or atom-atom collisional excitation has resulted in a leap forward such that the above amounts signify most important and delicate checks for theories of atomic collision approaches. equally, the robust (e, 2e) experiments (electron-electron coincidences from effect ionization of atoms) have attracted a lot cognizance the place stronger experimental experiences and unique theoretical description offer a wealth of data on both the col­ lisional ionization approach or the atomic constitution of the objective atom. Interference results, many-electron correlations, and effort and angular momen­ tum alternate among electrons in a Coulomb box playa decisive position within the below­ status of postcollision interactions. New effects on coherence results and orienta­ tion and alignment in collisional strategies of ions with surfaces and crystal lattices convey hyperlinks to proper interference phenomena in atomic collisions. In small-angle elastic electron-atom scattering the influence of angular coherence could be studied in a crossed beam experiment.

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Are also reported. ,~ Figure 6_ Relative cross section for the ejection of He Is electrons in {} and

Giardini-Guidoni, R. Fantoni, R. Camilloni, G. Stefani, Adv. in Mass Spectr. 8 (1979). 3 Low-Energy Electron Impact Ionization with Completely Determined Kinematics H. EHRHARDT, K. JUNG, AND E. SCHUBERT Nonresonant ionization of helium and neon atoms by electrons has been measured at collision energies between 30 and 250 e V. In a coincidence experiment scattering and ejection angles as well as energies of both outgoing electrons are determined. The results divide themselves into two energy ranges: (i) For Eo > 50 eV the ionizing collision proceeds nearly like a classical binary collision in which the momentum transfer of the scattered electron is added to the momentum distribution of the target electron.

18) The various calculated cross sections differ enough to indicate that the factorized Born is a worse approximation than the t matrix. The unfactorized Geltman's cross section is in good agreement with the data, although the experimental errors are too large to discriminate between Born and Coulomb projected Born with exchange (CPBE). These indications are confirmed by the data taken in different geometries. In Figure 5 the absolute measurements performed on He in symmetric coplanar conditions are reported for energies ranging from 200 to 3600 eV.

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