Singlet delta oxygen concentration and the main process of its decrease in the afterglow of a DC discharge in oxygen flow

Shepelenko, A. A.; Kupryaev, N. V.; Mikheyev, P. A.

doi:10.1134/s0018151x11060216

Cited by 3 publications

(4 citation statements)

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“…However, investigation (discussed in Appendix A) reveals no credible primary source, and we have chosen not to include this reaction in the present model. The motivation for continued interest in this reaction, in spite of the sparse evidence, appears to be inconsistency between calculated and measured O 2 (a 1 ∆ g ) densities [123]. An alternative process, also tending to reduce the O 2 (a…”

Section: Neutral Chemistrymentioning

confidence: 99%

“…Whether this was because their views were unread, even by those who cited them, is impossible to say. In some cases, interest in this reaction may have been motivated by over-predictions of the O 2 (a 1 ∆ g ) by some models [123], relative to some experiments, but even if this were so, one would have thought the absence of primary experimental evidence was worth noting. is well documented.…”

Section: Uncertainty and Error In Complex Plasmamentioning

confidence: 99%

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Uncertainty and error in complex plasma chemistry models

Turner

2015

Plasma Sources Sci. Technol.

101

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Abstract. Chemistry models that include dozens of species and hundreds to thousands of reactions are common in low-temperature plasma physics. The rate constants used in such models are uncertain, because they are obtained from some combination of experiments and approximate theories. Since the predictions of these models are a function of the rate constants, these predictions must also be uncertain. However, systematic investigations of the influence of uncertain rate constants on model predictions are rare to non-existent. In this work we examine a particular chemistry model, for helium-oxygen plasmas. This chemistry is of topical interest because of its relevance to biomedical applications of atmospheric pressure plasmas. We trace the primary sources for every rate constant in the model, and hence associate an error bar (or equivalently, an uncertainty) with each. We then use a Monte Carlo procedure to quantify the uncertainty in predicted plasma species densities caused by the uncertainty in the rate constants. Under the conditions investigated, the range of uncertainty in most species densities is a factor of two to five. However, the uncertainty can vary strongly for different species, over time, and with other plasma conditions. There are extreme (pathological) cases where the uncertainty is more than a factor of ten. One should therefore be cautious in drawing any conclusion from plasma chemistry modelling, without first ensuring that the conclusion in question survives an examination of the related uncertainty. PACS numbers:Uncertainty and Error in Complex Plasma Chemistry Models 2

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Section: Neutral Chemistrymentioning

confidence: 99%

Section: Uncertainty and Error In Complex Plasmamentioning

confidence: 99%

Uncertainty and error in complex plasma chemistry models

Turner

2015

Plasma Sources Sci. Technol.

101

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“…There has been a long standing interest in the possibility of developing a discharge driven oxygen iodine laser (DOIL), where O 2 (a 1 ∆) is produced via electric discharge [7][8][9][10][11][12][13]. In the DOIL devices investigated todate [12], the low small-signal gain of the active medium has prevented the efficient extraction the energy stored in singlet oxygen O 2 (a 1 ∆) [17].…”

Section: Introductionmentioning

confidence: 99%

“…as phase processes involving the reactive oxygen species O 2 (a 1 ∆), O( 3 P) and O 3 have been studied extensively due to their importance in the terrestrial atmosphere [1][2][3][4][5][6], oxygencontaining plasmas [7][8][9][10], the oxygen-iodine laser [11][12][13][14] and combustion [15][16]. There has been a long standing interest in the possibility of developing a discharge driven oxygen iodine laser (DOIL), where O 2 (a 1 ∆) is produced via electric discharge [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%