Low pressure water vapour discharge as a light source: II. Electrical characteristics

The electric field strength, electrode fall voltage, light emission characteristics and efficiency of a (Ar + H2O) dc discharge as functions of water vapour content, argon pressure and electric current are presented. The data show that the main processes of 306.4 nm OH band generation are (1) a coll...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2009-09, Vol.42 (17), p.175204-175204 (9)
Main Authors: Artamonova, E, Artamonova, T, Beliaeva, A, Khodorkovskii, M, Melnikov, A, Michael, D, Milenin, V, Murashov, S, Rakcheeva, L, Timofeev, N, Zissis, G
Format: Article
Language:English
Subjects:
Engineering Sciences
Optics
Photonic
Plasmas
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Summary:The electric field strength, electrode fall voltage, light emission characteristics and efficiency of a (Ar + H2O) dc discharge as functions of water vapour content, argon pressure and electric current are presented. The data show that the main processes of 306.4 nm OH band generation are (1) a collision between an excited argon atom and a water molecule with simultaneous excitation of OH into the A 2Sigma+ state and (2) electron excitation of a ground state hydroxyl molecule produced by a quenching process from a water molecule. Electric field strength measurements make it possible to conclude that the light production efficiency of the plasma under study can reach 35 lm W-1. It is possible, with these data, to propose a model of the plasma in question having reasonable accordance with the experiment and show the way to further increase the efficiency.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/42/17/175204