Preliminary investigations of optical emission spectroscopy atmospheric plasma for microbial inactivation

This paper explores the reactive species in helium plasma based on study of microbial inactivation effect. Optical emission spectroscopy was employ to analyze basic mechanism of plasma for microbial inactivation. Inactivation process was carried on bacteria Escherichia coli. Bacteria were fully inactivated at helium flow rate 600 ml/min. There are variations of each reactive species in different flow rate such as volume of species and intensity. The reactive species such as nitrogen, oxygen, helium were detected using spectrometer. Every species in plasma flume play important role in inactivation process. By observing the emission spectrum, it enables to understand and optimizing the microbial inactivation process and also gives insight in the plasma physics and chemical process.