Abstract
The first three reactions of the Calcote mechanism for soot formation, that is, C3H +3 +C2H2→C5H +5 , C5H +5 →C5H +3 H2, and C5H +3 +C2H2→C7H +5 , have been studied based on chemi-ions withdrawn directly from a premixed methane-oxygen flame by supersonic molecular beam sampling. The first reaction is reversible and involves the formation of a specific encounter complex sensitive to pressure and ion kinetic energy. The second reaction appears to require large amounts of internal energy in the C5H +5 ion to proceed. The third reaction is reversible; however, in contrast to the initiating reaction, the C5H +3 ion formed from the [C7H +5 ]* complex exhibits a much lower reactivity. The conclusions are based on ion-molecule reactions as well as collision activation mass spectrometry of isolated chemi-ions. In addition, the product distributions as functions of pressure and ion kinetic energy were studied.
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Egsgaard, H. Investigation of the initial reactions of the Calcote mechanism for soot formation. J Am Soc Mass Spectrom 7, 559–564 (1996). https://doi.org/10.1016/1044-0305(95)00708-3
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DOI: https://doi.org/10.1016/1044-0305(95)00708-3