Electron-Impact Excitations of Hydrogenic Ions in Strongly Coupled Plasmas

Astronomy and Astrophysics – Astronomy

Scientific paper

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Atomic Processes, Plasmas

Scientific paper

Plasma screening effects are investigated on electron-ion collisional excitations in strongly coupled plasmas. Scaled cross sections for 1s-->2p0(m=0) excitation is obtained using the ion-sphere model potential with the close-encounter effects. Ground and excited bound wave functions in strongly coupled plasmas are obtained using the Ritz variation and perturbation methods. The semiclassical straight-line trajectory approximation is applied to the motion of the projectile electron in order to investigate the variation of the transition probabilities as a function of the impact parameter and ion-sphere radius. The transition probability neglecting the screening effects on the target atomic wave functions is found to be greater than that including the screening effects on the target atomic wave functions. It is shown that the target screening effects are slightly decreased with an increase of the projectile energy.

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