Abstract
Results of photometric measurements on fuel-rich, atmospheric-pressure, laminar, premixed H
2
+ O
2
+ N
2
flames with and without small proportions of added calcium, strontium and barium are reported. These results, together with earlier observations on alkaline earth metals E in flames, are interpreted in terms of a set of chemical reactions involving the gasphase additive species E, EO, EOH, E(OH)
2
, EOH
+
and E
+
and the flame species H, OH, H
2
and H
2
O. The interpretation offered differs somewhat from those of previous workers, particularly with regard to the significance of non-equilibrium effects, but nevertheless provides an overall description of alkaline earth flame chemistry consistent with all available observations. Thermochemical data are tabulated for key reactions.
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42 articles.
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