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Dynamic orientation effects on electron-impact excitations in kappa-Maxwellian plasmas

The orientation phenomena for the 1s → 2p±1 transitions in electron–ion collisional excitations in kappa-Maxwellian plasmas are investigated by using the dynamic interaction potential. The plasma dielectric function in kappa-Maxwellian plasmas is used to obtain the scaled transition probabilities for the 1s → 2p±1 excitations. The semiclassical straight-line trajectory approximation is applied to the motion of the projectile electron in order to visualize the variation of the dynamic orientation parameter as a function of the impact parameter, collision energy, projectile energy and spectral index κ. It is found that the probability of the m = −1 transition is suddenly increased for 1.5 < κ < 2 and is slightly decreased for κ > 2 for the small velocity ratio (v/v∥). It is also found that the probability of the m = −1 transition is decreased for v/v∥ < 2 and increased for v/v∥ > 2. The probability of the m = −1 transition is found to be maximum near the first Bohr radius of the target ion. In addition, the probability of the m = −1 transition is also found to decrease with decreasing Debye length.