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Title
Japanese: 
English:Elucidation of the Nitrogen Blue Afterglow in Atmospheric Pressure Helium Plasma Jet 
Author
Japanese: 榎本純, 菊地航行, 田口智也, 根津篤, 赤塚洋.  
English: Jun Enomoto, Wataru Kikuchi, Tomoya Taguchi, Nezu Atsushi, Hiroshi Akatsuka.  
Language English 
Journal/Book name
Japanese: 
English:Book of abstracts ICPIG2025 
Volume, Number, Page         p. 161
Published date July 15, 2025 
Publisher
Japanese: 
English:International Scientific Committe of ICPIG 
Conference name
Japanese: 
English:The International Conference on Phenomena in Ionized Gases (XXXVI ICPIG) 
Conference site
Japanese:エクサンプロヴァンス 
English:Aix-en-Provence 
Official URL https://icpig2025.sciencesconf.org/data/pages/Programme_book_with_speaker_list_6.pdf
 
Abstract For atmospheric pressure plasma jet, which is expected to have applications in medicine and other fields, atomic and molecular processes have been shown to determine the electron temperature and density using optical emission spectroscopy. Blue light, which was not observed in previous studies, was detected in the plasma plume. This phenomenon will be called “blue afterglow.” The continuum spectrum of atmospheric pressure plasma was previously thought to be be due to electron-neutral atom bremsstrahlung. However, the blue afterglow was considered to be origineated from excited states or ions of molecular nitrogen generated by Penning effect. It can be concluded that the blue afterglow is a plasma with a lower electron temperature than the helium plasma.

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