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Experimental verification of Boltzmann equilibrium for negative ions in weakly collisional electronegative plasmas

Abstract:

Weakly collisional Ar- O2 electronegative plasmas are investigated in a dc multidipole chamber. An electronegative core and an electropositive halo are observed. The density ratio of negative ions to electrons (α) in the nondrifting bulk is found to be 0.43. The profile of α is found using both the phase velocity of ion acoustic waves and the drift velocity of positive ions determined by laser-induced fluorescence. The experiment shows that negative ions are in Boltzmann equilibrium with a te...

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Publication status:
Published

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Publisher copy:
10.1063/1.3119627

Authors


Ghim Kim, Y-C More by this author
Hershkowitz, N More by this author
Journal:
APPLIED PHYSICS LETTERS
Volume:
94
Issue:
15
Pages:
151503-151503
Publication date:
2009-04-13
DOI:
ISSN:
0003-6951
URN:
uuid:180d9ec0-e2c5-40c2-b3de-812483c94ba6
Source identifiers:
190318
Local pid:
pubs:190318

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