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OH Density Measurements by Time‐ R esolved Broad Band Absorption Spectroscopy in a He– H 2 O Dielectric Barrier Discharge with Small O 2 Addition
Author(s) -
Martini Luca Matteo,
Dilecce Giorgio,
Scotoni Mario,
Tosi Paolo,
Benedictis Santolo De
Publication year - 2014
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201300116
Subject(s) - analytical chemistry (journal) , oxygen , dielectric barrier discharge , dielectric , absorption (acoustics) , spectroscopy , absorption spectroscopy , chemistry , materials science , atomic physics , optics , optoelectronics , environmental chemistry , physics , quantum mechanics , composite material , organic chemistry
We have measured OH densities by time‐resolved broad‐band absorption spectroscopy in a He–H 2 O–O 2 dielectric barrier discharge, with the aim to investigate the effect of water and oxygen addition on OH production. The results are examined in the light of literature data, in particular model calculations of reactive oxygen species (ROS) concentrations in a rf discharge with similar gas mixtures. Although relevant to different systems, the comparison is nevertheless interesting. At low water content and no oxygen a fair agreement is found with the model. The observed dependence on water and oxygen, at almost constant discharge power, is instead found to be smoother than the calculated one, probably because in our discharge the power invariance does not imply a constant production of OH.