INVESTIGATIONS OF THE REACTION BETWEEN CH2(X)OVER-TILDE3B1) AND O2 IN THE TEMPERATURE-RANGE 233K-LESS-THAN-OR-EQUAL-TO-T-LESS-THAN-OR-EQUAL-TO-433K

The reaction between CH2(X3B1) radicals ((CH2)-C-3) and O2, (CH2)-C-3 + O2 --> products, (1) has been studied in a discharge flow reactor with Laser Magnetic Resonance (LMR) detection of (CH2)-C-3 and OH radicals and Electron Spin Resonance detection of O and H atoms. From the measured concentration-versus-time profiles of [(CH2)-C-3)] in the absence and presence of a large excess of O2 the overall rate coefficient of the reaction was found to be k1 = (8.7 +/- 2.0) . 10(12) . exp[-(4.2 +/- 1.0)kJ . mol-1/R . T]cm3/mol . s in the temperature range 233 K less-than-or-equal-to T less-than-or-equal-to 433 K. A limit for the contribution of H atom forming reaction channels of <20% was determined. The results are discussed in relation to available literature data on the formation of stable products. Main reaction channels leading directly to production of CO + H2O and H-2 + CO2 are concluded to be of importance.