INVESTIGATION OF THE REACTION OF (CH2)-C-3 WITH NO AT HIGH-TEMPERATURES

The reaction (CH2)-C-3 + NO was studied behind incident shock waves ov er the temperature range 1100-2600 K by following the H and O atom for mation with Atomic Resonance Absorption Spectroscopy (ARAS) and the OH radical formation with Laser Absorption. In the temperature range fro m 1100 to 2500 K the rate constant of the H atom formation formally at tributed to a reaction channel giving HCNO + H (1h) obtained on the ba sis of the experiments reported here is k(1h) = 10((12.4+/-0.2)). exp (-(25 +/-2) kJ mol(-1)/RT) cm(3) mol(-1) s-1. The rate constant of the channel leading to HCN+OH (1d) was determined to be k(1d) = 10(11.7+/ -0.3). exp (-(12+/-2) kJ mol(-1)/RT) cm(3) mol(-1) s(-1). The evaluati on of the experimental profiles by means of computer simulation leads to an overall rate constant of about k(1) = (1+/-0.5). 10(12) cm(3) mo l(-1) s(-1) without any noticeable temperature dependence within the e rror limits in the temperature range from 1200 to 2600 K. The contribu tion of a reaction channel leading directly or indirectly to O (or N) atoms was found to be less than 15% of the overall reaction at tempera tures below 2000 K.