DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
MECHANISMS OF PRODUCTION AND REMOVAL OF ELECTRONS IN FLAMES
AEROCHEM RESEARCH LABS INC PRINCETON N J
Pagination or Media Count:
The mechanism of ion formation and removal in hydrocarbon and some other flames was studied by Langmuir probes and RF mass spectrometry down to 1 mm Hg. A mass spectrometric technique was developed which permits ion profiles through the flame to be obtained with a high degree of spatial resolution and a minimum disturbance to the flame. The major ion is H3O , with C3H3 being next in concentration. The results were interpreted in terms of chemiionizati n, e.g., CH O yields CHO e-. The rate in ionscc x sec of ion formation in hydrocarbonair flames equivalence ratio, R equals 0.88 is about 6 x 10 to the 9th power p squared, where p is in mm Hg. This reaction is followed by the very rapid ion-molecule reaction CHO H2O yields H3OCO, so that the half-life of the initiall produced ion is about 10 to the -7th power seconds. The decay of ion concentration downstream from the flame is used to calculate the recombination coefficient which for propane-air R equals 0.88 is 2 x 10 to the -7th power ccsec and independent of pressure.
APPROVED FOR PUBLIC RELEASE