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

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/Cl 2 ) 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/Cl 2 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/Cl 2 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/Cl 2 based excimer source is mainly centered on 222 nm and a weak band obtained at 258 nm of Cl 2 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.