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Is the Rotational Temperature of OH(A–X) for Discharges in and in Contact with Liquids a Good Diagnostic for Determining the Gas Temperature?
Author(s) -
Bruggeman Peter,
Schram Daan C.,
Kong Michael G.,
Leys Christophe
Publication year - 2009
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.200950014
Subject(s) - rotational temperature , rotational energy , mean kinetic temperature , atmospheric pressure , population , boltzmann distribution , chemistry , kinetic energy , rotational speed , atomic physics , boltzmann constant , analytical chemistry (journal) , thermodynamics , physics , meteorology , classical mechanics , molecule , chromatography , demography , organic chemistry , sociology
In this paper the rotational temperature of OH(A–X) and rotational population distribution of OH(A) are investigated for streamer discharges in bubbles and glow discharges with liquid electrodes, both at atmospheric pressure. The influence of the filling gas is investigated in detail and the non‐Boltzmann nature of the rotational population distributions is discussed. It is shown that the rotational population distribution of OH(A) is even at atmospheric pressure an image of the formation process or is at least influenced by it. As a consequence the rotational temperature is in this case not a good estimate of the gas temperature as the rotational population distribution is not an image of a kinetic temperature. In some cases rotational states with small rotational numbers offer a possibility to obtain the gas temperature. The influence of these results on the determination of gas temperatures in the field of liquid plasmas is discussed.