# Siam Physics Congress 2015

20-22 May 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

## Cold atmospheric pressure plasma diagnostics using an UV-absorption spectroscopy

20 May 2015, 14:00
3h 30m
Board: PLA-05
Poster presentation Ion and Plasma Physics

### Speaker

Mr Yuthana Thana (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand)

### Description

Cold atmospheric pressure plasma consisting of OH, O, O${}_3$, NO, and NO${}_2$ radicals is currently popular in biomedical applications. This is due to its ability on destroying microbes and stimulating on production of new cells. For such applications, development of techniques to measure density of any radical in the plasma is important. An optical emission spectroscopy (OES) technique, which is used in most laboratories, has a limitation for estimating the radical density on specific area. In this study, we develop a method to use an UV-absorption spectroscopy for measuring the density of the OH, NO, and NO${}_2$ radicals on sample surfaces. Study on effect of the atmospheric jet with various conditions is performed. Principle and procedure of the UV-absorption spectroscopy technique as well as the experimental results will be reported and discussed in this contribution.

### Primary author

Mr Yuthana Thana (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand)

### Co-author

Dr Dheerawan Boonyawan (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand)

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