Resemblance in gas composition of Ar–N2–O2 plasmas and Ar–NO plasmas

J.H. Helden, van, R.A.B. Zijlmans, D.C. Schram, R.A.H. Engeln

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)


mixtures and Ar–NO mixtures with quantitative mass spectrometry. In the former, mainly N2 and O2, but also a significant amount of nitric oxide (NO) was formed, i.e. up to 5% of the background gas was NO. In the inverse experiment, in which NO was admixed to an argon plasma, up to 92% of the NO was converted into N2 and O2. The observed molecules are mostly generated in wall association processes but also by gas phase reactions between N atoms and O2 molecules leading to NO. The two types of plasmas show a strong mutual resemblance in the steady-state gas composition if substantial dissociation can be reached in the residence time of the gases in the plasma, i.e. 5% NO and 95% N2 and O2, although the starting conditions are completely different. It seems that in first order the system prefers to produce the most thermodynamically stable molecules.
Original languageEnglish
Pages (from-to)025020-1/11
Number of pages11
JournalPlasma Sources Science and Technology
Issue number2
Publication statusPublished - 2009


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