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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14143
Title: Near-infrared collisional radiative model for Xe plasma electrostatic thrusters: The role of metastable atoms
Authors: Dressler R.A.
Chiu Y.-H.
Zatsarinny O.
Bartschat K.
Srivastava R.
Sharma L.
Published in: Journal of Physics D: Applied Physics
Abstract: Mestastable Xe atoms play an important role in the collisional radiative processes of dense xenon plasmas, including those of electric thrusters for space vehicles. Recent measurements and calculations of electron-excitation processes out of the 5p56s J = 2 metastable state (1s5 state in Paschen notation) have allowed for the development of a collisional radiative model for Xe near-infrared (NIR) emissions based on the population of the metastable level through 2p-1s5 radiative transitions, and based on depopulation through electron-impact excitation. A modified plasma radiative model incorporating newly computed electron-impact excitation cross sections using both relativistic distorted wave and semi-relativistic Breit-Pauli B-Spline R-matrix methods is presented. The model applies to optically thin, low-density regions of the thruster plasma and is most accurate at electron temperatures below 10 eV. The model is tested on laboratory spectral measurements of the D55 TAL and BHT-200 Hall thruster plasma NIR radiation. The metastable neutral fraction is determined to rise from 0.1 to slightly above 1% as the electron temperature increases from ∼2 to 10 eV, reaching a maximum around 15 eV. Electron temperatures derived with the modified model are approximately 20% lower than a previous version of the model that used an approximate approach to account for metastable population and line intensity enhancement. © 2009 IOP Publishing Ltd.
Citation: Journal of Physics D: Applied Physics (2009), 42(18): -
URI: https://doi.org/10.1088/0022-3727/42/18/185203
http://repository.iitr.ac.in/handle/123456789/14143
Issue Date: 2009
ISSN: 223727
Author Scopus IDs: 7007013755
7202775630
7003569976
8939149800
7401868829
14046198100
Author Affiliations: Dressler, R.A., Spectral Sciences Inc., 4 Fourth Ave, Burlington, MA 01803, United States
Chiu, Y.-H., Space Vehicles Directorate, Air Force Research Laboratory, Hanscom AFB, MA 01731, United States
Zatsarinny, O., Department of Physics and Astronomy, Drake University, Des Moines, IA 50311, United States
Bartschat, K., Department of Physics and Astronomy, Drake University, Des Moines, IA 50311, United States
Srivastava, R., Department of Physics, Indian Institute of Technology, Roorkee 247667, India
Sharma, L., Department of Physics, Indian Institute of Technology, Roorkee 247667, India, Physikalisches Institut, Universit'at Heidelberg, D-69120 Heidelberg, Germany
Corresponding Author: Dressler, R. A.; Spectral Sciences Inc., 4 Fourth Ave, Burlington, MA 01803, United States
Appears in Collections:Journal Publications [PH]

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