TY - JOUR
T1 - Investigation of the initial reactions of the Calcote mechanism for soot formation
AU - Egsgaard, H.
PY - 1996
Y1 - 1996
N2 - The first three reactions of the Calcote mechanism for soot formation, that is, C3H3/+ + C2H2 → C5H5/+, C5H5/+ → C5H3/+ + H2, and C5H3/+ + C2H2 → C7H5/+, have been studied based on chemi-ions withdrawn directly from a premixed methane oxygen flame by supersonic molecular beam sampling.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 C5H5/+ ion to proceed. The third reaction is reversible; however, in contrast to the initiating reaction, the C5H3/+ ion formed from the [C7H5/+]* 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.
AB - The first three reactions of the Calcote mechanism for soot formation, that is, C3H3/+ + C2H2 → C5H5/+, C5H5/+ → C5H3/+ + H2, and C5H3/+ + C2H2 → C7H5/+, have been studied based on chemi-ions withdrawn directly from a premixed methane oxygen flame by supersonic molecular beam sampling.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 C5H5/+ ion to proceed. The third reaction is reversible; however, in contrast to the initiating reaction, the C5H3/+ ion formed from the [C7H5/+]* 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.
KW - Atmosfæriske processers betydning for miljøet; Vindenergi og atmosfæriske processer
U2 - 10.1016/1044-0305(95)00708-3
DO - 10.1016/1044-0305(95)00708-3
M3 - Journal article
SN - 1044-0305
VL - 7
SP - 559
EP - 564
JO - Journal of the American Society for Mass Spectrometry
JF - Journal of the American Society for Mass Spectrometry
ER -