Formation and decay of the Rydberg states of multiply charged ions interacting with solid surfaces
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Processes of formation and decay of the Rydberg states of multiply charged ions escaping solid surfaces with intermediate velocities (v approximate to 1 a.u.) represent complex quantum events that require a detailed quantum description. We have developed a two-state vector model for the population process, with the functions Psi(1) and Psi(2) for definition of the state of a single active electron. The electron exchange between the solid and the moving ion is described by a mixed flux through a plane positioned between them. For the low values of the angular momentum quantum numbers l the radial electronic coordinate rho can be neglected, whereas for the large-l values a wide space region around the projectile trajectory was taken into account. The reionization of the previously populated states is considered as a decay of the wave function Psi(2). The corresponding decay rates are obtained by an appropriate etalon equation method: in the large-l case the radial electronic coordinate r...ho is treated as a variational parameter. The theoretical predictions based on that population-reionization mechanism are compared with the available beam-foil experimental data, as well as the experimental data obtained in the interaction of multiply charged ions with micro-capillary foil. Generally, the model reproduces the experimentally observed non-linear trend of the l distributions from l = 0 to l(max) = n - 1.
Source:Journal of Physics: Conference Series, 2010, 257
- Ministry of Science and Technological Development, Republic of Serbia [14 1029]
- 25th Summer School and International Symposium on the Physics of Ionized Gases - SPIG 2010, Aug 30-Sep 03, 2010, Donji Milanovac, Serbia