Radiative Transitions in Quasi-Molecules

  • F. W. Saris
  • F. J. de Heer


In 1972 a broad X-ray band was reported to be observed during Ar bombardment of C, Al, Si and Fe 1). These new X-rays were speculatively interpreted as arising from the radiative decay of a projectile 2p vacancy in the quasi-molecule transiently formed in the projectile-target atom encounter. Since then experimental studies of ion-induced X-ray spectra were no longer confined to the prominent characteristic lines. Measurements of cross sections for characteristic X-ray production have certainly stimulated the development of the molecular model for ion-atom collision processes. Yet the study of the continuum part of the X-ray spectrum may give more detailed information on the electronic states of the transient molecule. In the past two years the X-ray bands have been subject to intense investigations by various research groups 2,3,4,5,6,7). It is the aim of this paper to review these experimental studies and to briefly discuss some prospects of a direct experimental verification of calculated diabatic molecular orbitals. We shall confine ourselves to data obtained at beam energies ≤ 1 MeV, for high energy data will be discussed in the following paper by Mokler. For a theoretical review of the theory of the Quasi-Molecular Model of Atomic Collisions (and of Molecular Orbital X-rays) one is referred to the preceeding paper by Lichten.


Radiative Transition Internuclear Distance Solid Target High Energy Side Rotational Coupling 
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Copyright information

© Plenum Press, New York 1975

Authors and Affiliations

  • F. W. Saris
    • 1
  • F. J. de Heer
    • 1
  1. 1.FOM-Institute for Atomic and Molecular PhysicsAmsterdamThe Netherlands

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