Anti-screening optically allowed and forbidden collisional excitations in nonthermal astrophysical plasmas

Journal Article · Fri Aug 01 04:00:00 EDT 2014 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/790/2/156· OSTI ID:22365446

Hong, Woo-Pyo ^[1]; Jung, Young-Dae ^[2]

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1. Department of Electronics Engineering, Catholic University of Daegu, Hayang 712-702 (Korea, Republic of)
2. Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180-3590 (United States)

The influence of nonthermal shielding on the optically allowed and forbidden anti-screening channels for ion-ion collisional excitations is investigated in astrophysical Lorentzian plasmas. The semiclassical trajectory method and effective interaction Hamiltonian are employed to obtain the transition amplitudes, differential cross-sections, and momentum transfer-dependent effective projectile charges for the optically allowed and forbidden excitation channels as functions of the impact parameter, collision energy, Debye radius, and spectral index of nonthermal astrophysical plasmas. It is found that the nonthermal effect suppresses the ion-ion collisional excitation probability in astrophysical Lorentzian plasmas. Additionally, the influence of nonthermal shielding on the optically allowed transition is found to be more significant than that on the optically forbidden transition. The variations of the nonthermal shielding effects on the optically allowed and forbidden anti-screening channels in astrophysical nonthermal plasmas are also discussed.

• OSTI ID: 22365446
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 790; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
79 ASTRONOMY AND ASTROPHYSICS
ASTROPHYSICS
COSMOLOGY
DEBYE LENGTH
DIFFERENTIAL CROSS SECTIONS
EXCITATION
HAMILTONIANS
ION-ION COLLISIONS
MOMENTUM TRANSFER
SEMICLASSICAL APPROXIMATION
TRANSITION AMPLITUDES