Research Articles

Influence of gas discharge parameters on emissions from a dielectric barrier discharge excited argon excimer lamp

Peter Baricholo, Dumisani J. Hlatywayo, Hubertus M. von Bergmann, Timo Stehmann, Erich Rohwer, Mike Collier
South African Journal of Science | Vol 107, No 11/12 | a581 | DOI: https://doi.org/10.4102/sajs.v107i11/12.581 | © 2011 Peter Baricholo, Dumisani J. Hlatywayo, Hubertus M. von Bergmann, Timo Stehmann, Erich Rohwer, Mike Collier | This work is licensed under CC Attribution 4.0
Submitted: 06 January 2011 | Published: 03 November 2011

About the author(s)

Peter Baricholo, Department of Applied Physics, National University of Science and Technology, Zimbabwe
Dumisani J. Hlatywayo, Department of Applied Physics, National University of Science and Technology, Zimbabwe
Hubertus M. von Bergmann, Laser Research Institute, Department of Physics, Stellenbosch University, South Africa
Timo Stehmann, Laser Research Institute, Department of Physics, Stellenbosch University, South Africa
Erich Rohwer, Laser Research Institute, Department of Physics, Stellenbosch University, South Africa
Mike Collier, Department of Electronic Engineering, National University of Science and Technology, Zimbabwe

Abstract

A dielectric barrier discharge excited neutral argon (Ar I) excimer lamp has been developed and characterised. The aim of this study was to develop an excimer lamp operating at atmospheric pressure that can replace mercury lamps and vacuum equipment used in the sterilisation of medical equipment and in the food industry. The effects of discharge gas pressure, flow rate, excitation frequency and pulse width on the intensity of the Ar I vacuum ultraviolet (VUV) emission at 126 nm and near infrared (NIR) lines at 750.4 nm and 811.5 nm have been investigated. These three lines were chosen as they represent emissions resulting from de-excitation of excimer states that emit energetic photons with an energy of 9.8 eV. We observed that the intensity of the VUV Ar2* excimer emission at 126 nm increased with increasing gas pressure, but decreased with increasing excitation pulse frequency and pulse width. In contrast, the intensities of the NIR lines decreased with increasing gas pressure and increased with increasing pulse frequency and pulse width. We have demonstrated that energetic VUV photons of 9.8 eV can be efficiently generated in a dielectric barrier discharge in Ar.

Keywords

argon excimer lamp; dielectric barrier discharge; flow rate; pulsed excitation; second continuum

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Crossref Citations

1. Methane from benzene in argon dielectric barrier discharge
Tomi Nath Das, G.R. Dey
Journal of Hazardous Materials  vol: 248-249  first page: 469  year: 2013  
doi: 10.1016/j.jhazmat.2013.01.028