The reaction k H , + N O was studied behind incident shock waves over the temperature range 1100-2600K by following the H and 0 atom formation with Atomic Resonance Absorption Spectroscopy (ARAS) and the OH radical formation with Laser Absorption. In the temperature range from 1100 to 2500 K the rate constant of the H atom formation formally attributed to a reaction channel giving HCNO+H (1 h) obtained on the basis of the experiments reported here is k , ,, = lo('* 4 * 0 ').exp (-(25 * 2) kJ rnol-'/RT) crn3 mol-s-'. The rate constant of' the channel leading to HCN+OH (1 d) was determined to be k , , = 10("7"o.3)~exp(-(12+2) k J m o l~' / R T ) c m 3 m o l s -' .

The pyrolysis of methanol was investigated behind incident shock waves at temperatures and densities between 1400 and 2200 K and 1 · 10−6 and 5 · 10−6 mol/cm3, respectively. Narrow band‐width laser absorption for OH radicals and ARAS technique for H atoms was used to determine the decomposition channels. For the experimental conditions described above the direct OH‐formation is found to be the main channel of about 80% of the decomposition rate. The channel leading to H and CH2OH is found to be less than 5%. There remains the possibility of channels leading from methanol to 1CH2 + H2O or to CH2O + H2.

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The reaction of CH3 radicals with O2 was investigated behind incident shock waves at temperatures between 1400 and 2300 K and total densities between 2 · 10−6 and 8 · 10−6 mol/cm3. The formation of O and H atoms was followed by atomic resonance absorption spectroscopy (ARAS) at 130.5 nm and 121.6 nm. A rate constant of 2.3 · 1013 exp(–15400 K/T) cm3/mol s for the reaction CH3 O2 + CH3O + O was determined.

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