2683-96-7Relevant academic research and scientific papers
Kinetics of the Reactions of CH2(X3B1) Radicals with NO and NO2
Seidler, V.,Temps, F.,Wagner, H. Gg.,Wolf, M.
, p. 1070 - 1073 (1989)
The kinetics of CH2 radicals in their triplet electronic ground state (X3B1) with NO and NO2 3B1) + NO -> products (1); CH2(X3B1) + NO2 -> products (2)> have been studied at room temperature in isothermal discharge flow systems.CH2 radicals were generated either by exciplex laser photolysis of CH2CO or via the reaction O + CH2CO -> CH2 + CO2.The CH2 concentration was monitored directly with a far-infrared laser magnetic resonance spectrometer.From the decay of under pseudo-first-order conditions the rate conatants of reactions 1 and 2 were obtained to be k1(296K) = (2.2 +/- 0.2) x 1E13 cm3/(mol s) and k2(296K) = (5.9 +/- 1.4) x 1E13 cm3/(mol s).
Fast beam photodissociation of the CH2NO2 radical
Cyr, D. R.,Leahy, D. J.,Osborn, D. L.,Continetti, R. E.,Neumark, D. M.
, p. 8751 - 8764 (1993)
The photodissociation of the nitromethyl radical, CH2NO2, has been studied using a fast beam photofragment translational spectrometer.In these experiments, a fast beam of mass selected, internally cold nitromethyl radicals is formed via negative ion photodetachment of CH2NO2- and subsequently dissociated.The recoiling photofragments are detected in coincidence using a microchannel plate detector equipped with a time- and position-sensing anode.Two dissociation product channels are observed at each of three dissociation wavelengths investigated in the range 240-270nm and are identified as (I) CH2NO2 -> CH2NO + O and (II) CH2NO2 -> H2CO + NO.In marked contrast to the ultraviolet photodissociation of CH3NO2, no evidence is found for simple C-N bond fission to give (III) CH2NO2 -> CH2 + NO2.Translational energy and angular distributions were obtained for the two observed channels.The translational energy distribution of channel (I) peaks at only 5-8 kcal/mol, while the distribution for channel (II) peaks at ca. 60 kcal/mol.The angular distributions for both channels are largely isotropic.The nature of the electronic excitation and dissociation dynamics are considered at length.The upper state in the electronic transition is assigned to the 1 2B1 state.Results of attempts to model various aspects of the dissociation dynamics as statistical processes on the ground state surface indicate this mechanism is very unlikely.Instead, both dissociation channels are believed to occur primarily on excited state surfaces, and mechanisms for these processes are proposed.
