Line emission and alignment effects in state selective electron transfer in He $\mathsf{^{2+}}$ -Li(2s, 2p ${\mathsf{\Sigma}}$ , 2p ${\mathsf{\Pi}}$ ) collisions

Perumal, A. N.; Tripathi, Dharmendra

doi:10.1007/s100530050023

The European Physical Journal D - Atomic, Molecular and Optical

2000

DOI: 10.1007/s100530050023

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Line emission and alignment effects in state selective electron transfer in He $\mathsf{^{2+}}$ -Li(2s, 2p ${\mathsf{\Sigma}}$ , 2p ${\mathsf{\Pi}}$ ) collisions

A. N. Perumal

Dharmendra Tripathi

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Cited by 6 publications

References 38 publications

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Cross sections of charge exchange and ionization in O8+ +H collision in Debye plasmas

Pandey

Lin

2012

Physics of Plasmas

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Charge exchange and ionization processes in O8+ +H collision system in a Debye plasma are studied using the classical trajectory Monte Carlo (CTMC) method in the collision energy ranging from 1 keV/amu to 500 keV/amu. Total charge exchange and ionization cross sections have been determined in both screening and unscreening environments. In the unscreened case, partial cross sections for transfer into individual n shells of the projectile have also been determined. An interesting and remarkable feature of sudden increase in the ionization cross sections at lower velocities is discussed in terms of the CTMC framework. Results are analyzed in light of available theoretical and experimental results. The cross sections dependencies on Debye screening lengths have been investigated, and plasma screening effect on charge exchange and ionization cross sections has been found throughout the collision energies range, but is particularly pronounced at low projectile collision energies. The sudden rise in the ionization cross sections towards lower energies is explained qualitatively in terms of the multiple encounter model.

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Cross sections of charge exchange and ionization in O8+ +H collision in Debye plasmas

Pandey

Lin

2012

Physics of Plasmas

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Unexplained features of capture and ionization for ion–aligned-Rydberg-atom collisions

Perumal

Tripathi

2001

Phys. Rev. A

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Observed but unexplained features, namely, oscillations in the capture cross sections and an unexpected increase in the ionization cross sections at lower velocities, are discussed using classical trajectory Monte Carlo simulated results for ion-aligned-Rydberg-atom collisions. The initial alignment ͑mϭ0, 1, and 2͒ dependence of the cross sections shows evidence of ''capture through quasimolecular ion formation,'' identified as the most likely cause for the oscillations. Spatial overlap, in addition to the velocity matching mechanism, is shown to play an important role in the collision process. The unexpected rise in the ionization cross section toward lower reduced velocities is explained qualitatively in terms of the multiple encounter model ͓Perumal and Tripathi, Nucl. Instrum. Methods B 143, 429 ͑1998͔͒.

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Excitation and alignment effects inAr8+−Cs(6s,6p)collisions at low energies

et al. 2002

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The influence of the excitation and the alignment of a laser-prepared target on the final nl m l distributions are studied in Ar 8ϩ -Cs(6p⌺) and Ar 8ϩ -Cs(6p⌸) collisions. These collisions are studied experimentally by means of near UV and visible photon spectroscopy ͑200-600 nm͒ in the 0.4 -4.0 keV/amu energy range, and theoretically by using the three-body classical trajectory Monte Carlo ͑CTMC͒ method at 0.1-4.0 keV/amu.Calculations of electronic energies for the one-electron ͕Ar 7ϩ -Cs͖ ϩ molecular system have allowed an analysis of the results in terms of dynamical couplings. Polarization rates for single-electron-capture lines corresponding to transitions between high-l values states are also measured. The comparison with those calculated from the CTMC results provides information about the magnetic sublevel distributions and the influence of the initial alignment of a laser-prepared target.

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Line emission and alignment effects in state selective electron transfer in He $\mathsf{^{2+}}$ -Li(2s, 2p ${\mathsf{\Sigma}}$ , 2p ${\mathsf{\Pi}}$ ) collisions

Cited by 6 publications

References 38 publications

Cross sections of charge exchange and ionization in O8+ +H collision in Debye plasmas

Cross sections of charge exchange and ionization in O8+ +H collision in Debye plasmas

Unexplained features of capture and ionization for ion–aligned-Rydberg-atom collisions

Excitation and alignment effects inAr8+−Cs(6s,6p)collisions at low energies

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