Asian Journal of Physics Vol 32, Nos 9 – 12 (2023) 487-493

Analysis and characterization of Kr/Cl2 based 222 nm far UV-C excimer source

Surbhi Bidawat1, Navin Kumar Sharma2, R P Lamba1, Mahendra Singh1, Alok Mishra1, Y Choyal2 and U N Pal1
1CSIR- Central Electronics Engineering Research Institute, Pilani-333 031, India
2School of Physics, Devi Ahilya Vishwavidyalaya, Indore-452 001, India
Dedicated to Prof B N Basu

A direct approach to limit airborne pathogens is to inactivate them within a short period of their production. Far-UV-C light (222 nm) through mercury free Krypton/Chlorine (Kr/Cl2) excimer source has been found to efficiently kill the pathogens without causing any harm to human skin. In the present work, experimental and computational analysis of dielectric barrier discharge (DBD) in Kr/Cl2 mixture excited by unipolar pulse of negative polarity has been carried out. The aim of the study is to identify the dominant charged species and various other operational parameters leading to the production of higher KrCl*(B state) in Kr/Cl2 excilamp. The creation and destruction mechanisms of various charged species in the gas-gap and the effect of chlorine percentage on the excimer density on the 222 nm radiation intensity have been analyzed. The characteristic emission spectra of the Kr/Cl2 based excimer source is mainly centered on 222 nm and a weak band obtained at 258 nm of Cl2 molecule. The 222 nm peak wavelength is the strongest line observed in the emission spectra that confirms the efficient generation of KrCl* excimer at this operating condition. © Anita Publications. All rights reserved.
Keywords: Dielectric barrier discharge, Excilamp, Fluid equation, Excimer.

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Method: Single- anonymous; Screened for Plagiarism? Yes
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