A passive measurement of dissociated atom densities in atmospheric pressure air discharge plasmas using vacuum ultraviolet self-absorption spectroscopy

Language
en
Document Type
Article
Issue Date
2014-04-07
Issue Year
2014
Authors
Laity, George
Fierro, Andrew
Dickens, James
Frank, Klaus
Neuber, Andreas
Editor
Abstract

We demonstrate a method for determining the dissociation degree of atmospheric pressure air discharges by measuring the self-absorption characteristics of vacuum ultraviolet radiation from O and N atoms in the plasma. The atom densities are determined by modeling the amount of radiation trapping present in the discharge, without the use of typical optical absorption diagnostic techniques which require external sources of probing radiation into the experiment. For an 8.0 mm spark discharge between needle electrodes at atmospheric pressure, typical peak O atom densities of 8.5 × 1017 cm−3 and peak N atom densities of 9.9 × 1017 cm−3 are observed within the first ∼1.0 mm of plasma near the anode tip by analyzing the OI and NI transitions in the 130.0–132.0 nm band of the vacuum ultraviolet spectrum.

Journal Title
Journal of Applied Physics
Volume
115
Issue
12
Citation
Journal of Applied Physics 115, 123302 (2014): 07.04.2014 <http://scitation.aip.org/content/aip/journal/jap/115/12/10.1063/1.4869895>
DOI
Zugehörige ORCIDs