Measurement of nitrogen dioxide and nitric oxide densities by using CEAS (cavity‐enhanced absorption spectroscopy) in nonthermal atmospheric pressure air plasma. Issue 1 (22nd October 2020)

• Record Type: Journal Article
• Authors: Hong, Young J.; Lim, Junsup; Choi, Jin S.; Weltmann, Klaus D.; Choi, Eun H.
• Other Names: Ito Masafumi guestEditor.; Reuter Stephan guestEditor.; Weltmann Klaus‐Dieter guestEditor.
• Is Part Of: Plasma processes and polymers. Volume 18:Issue 1(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-10-22
• Subjects: broadband CEAS (BBCEAS) -- cavity‐enhanced absorption spectroscopy (CEAS) -- nitric oxide (NO) -- nitrogen dioxide (NO2) -- nonthermal atmospheric pressure plasmas; Plasma polymerization -- Periodicals; Plasma-enhanced chemical vapor deposition -- Periodicals; Plasma chemistry -- Periodicals
• DOI: 10.1002/ppap.202000168
• Languages: English
• ISSNs: 1612-8850

Abstract

Abstract: Nonthermal atmospheric pressure plasmas are widely used in biomedicine and agriculture. Currently, radical density is used as an important parameter for the development of plasma biomedicine and agriculture. Especially, nitrogen dioxide (NO2 ) and nitric oxide (NO) radicals are significant species in these applications. These could be measured by using the cavity‐enhanced absorption spectroscopy (CEAS) technique. For the NO2 and NO radical density measurement, we used a visible LED (light‐emitting diode) of 660 nm and a mid‐infrared LD (laser diode) of 5238.6 nm, respectively. Radical densities can be calculated with the transmission ratio using Beer–Lambert law, which is obtained by the absorbed amount of laser intensity passed through the gas from the plasma jet in an optical cavity of CEAS. Abstract : Nonthermal atmospheric pressure plasmas are widely used in biomedicine and agriculture. Especially radical density is used as an important parameter for the developement of plasma argriculture. This review describes the nitrogen dioxide and nitric oxide radical densities in air plasma jet. These radical densities can be calculated with the transmission ratio using the cavity‐enhanced absorption spectroscopy. For air plasma jet, the nitric oxide density was about 10 times lower than the nitrogen dioxide.