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ANTI-SCREENING OPTICALLY ALLOWED AND FORBIDDEN COLLISIONAL EXCITATIONS IN NONTHERMAL ASTROPHYSICAL PLASMAS

Title
ANTI-SCREENING OPTICALLY ALLOWED AND FORBIDDEN COLLISIONAL EXCITATIONS IN NONTHERMAL ASTROPHYSICAL PLASMAS
Author
정영대
Keywords
atomic data; atomic processes; plasmas Online; only material: color figures
Issue Date
2014-08
Publisher
Published by the University of Chicago Press for the American Astronomical Society
Citation
Astrophysical Journal, 2014, 790(2), p.156
Abstract
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.
URI
http://iopscience.iop.org/article/10.1088/0004-637X/790/2/156/metahttp://hdl.handle.net/20.500.11754/47685
ISSN
0004-637X
DOI
10.1088/0004-637X/790/2/156
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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