Two-centre dielectronic transitions in fast highly charged ion–atom collisions
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Abstract:
We consider two-centre dielectronic transitions occurring in collisions of fast highly charged hydrogen-like projectiles with neutral atomic targets. In such collisions, in addition to the reaction channel due to the two-centre electron–electron interaction, the reaction channel induced by the two-centre electron–nucleus interactions becomes important. We show that the account of distortions of initial and final states of the target caused by the field of the projectile nucleus (which can also be viewed as imposing the Coulomb boundary conditions on these states) leads to an approach in which both these reaction channels are combined in a natural and relatively simple way. As a result, this approach enables one to extend calculations of different cross sections for two-centre dielectronic transitions from the high-velocity to the intermediate-to-high collision velocity regime.Keywords:
Electron capture
Highly charged ion
The paper deals with the mechanism of interaction between charged microparticles and the mass spectrometer target. Experimental data on measuring the ion flow parameters in case of high-speed impact of the charged particle are presented. The contribution of the charged particles potential and kinetic energy to the ionization of the mass spectrometers target matter is assessed.
Highly charged ion
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A semiclassical model for He is applied to the study of multiply charged ions colliding with He at intermediate energies. Single and double-electron capture and ionisation and capture-ionisation reactions are studied for incident-ion charge states q=+1 to +50 at 1 MeV amu-1. For charge states q>or approximately=+10, single electron capture is found to be dominated by a two-electron transition in which one electron is captured and the other is ionised.
Electron capture
Semiclassical physics
Highly charged ion
Effective nuclear charge
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A simple theory is presented for the process of electron capture when a fast incident projectile is scattered through large angles, i.e. greater than a few degrees. In this theory, the capture amplitude is shown to be proportional to the amplitude for ionisation of the target electron into a continuum state with velocity equal to the final projectile velocity. A particular feature of the model is the prediction of an enhanced capture probability, increasingly more pronounced with increasing collision velocity, when the projectile is scattered through a critical angle.
Electron capture
Impact parameter
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The electron capture to continuum (ECC) from atoms by a fast bare ion is investigated assuming that the electron-projectile interaction in the final state is a screened Coulomb potential. The cut-off Coulomb and Hulth\'en potentials are used to show that the ECC cross section is either finite or diverges as $\frac{1}{{v}^{2}}$ for small final relative electron-projectile velocities ($\stackrel{\ensuremath{\rightarrow}}{\mathrm{v}}$). Theoretically this represents a considerable deviation from the usual premise of the $\frac{1}{v}$ behavior given by the Coulomb factor. However, for gaseous targets we get the usual ECC peak shape as an average over the screening range of the interaction. We discuss some experimental conditions where anomalies due to screening are expected to be observable.
Electron capture
Screening effect
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Highly charged ion
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